// File: contracts/RTAS.sol




// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/// @title: ORacle-NFT
/// @author: manifold.xyz

import "./manifold/ERC721Creator.sol";

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//                                                                                                                                                                        //
//                                                                                                                                                                        //
//    /**                                                                                                                                                                 //
//     *Submitted for verification at Etherscan.io on 2022-08-01                                                                                                          //
//    */                                                                                                                                                                  //
//                                                                                                                                                                        //
//    Todd Anthony Stephens                                                                                                                                               //
//    //   ███    ███                                             ███    ███                                                                                              //
//    // ******************************************@@@/**************&@@@,,,,           @@@@*******************************************************************           //
//    // ..**..*****************/////////**********@@%@@**********@@@*.                     @@@@***********************************..........**.,**************           //
//    // *******************///////////////******@@%%(((@@@@****@@..     @@@@@@@@@@@@@((((      @@************************************************************/           //
//    // *******************////////*************@@%%%%%((((@@((    @#(((/////////////////##@@@@// %@*********************************************************/           //
//    // ********************************....@@..@@##%%%%%@@((    @@(((////////***********,,,,,,##@@@**********************************************************           //
//    // ************************************@@@@**@@%%%@@((    @@(((//////****////*******,,,,,,,,,(#@@********************************************************           //
//    // **************************************@@##@@%@@((((  @@%%%%%##////**///////**********,,,,,,,**##@@****************************************************           //
//    // **************************************@@//((@@@@@@@@@%%%%%%%((////////////*************,,,,,,,,,((@@**************************************************           //
//    // **************************************@@##@@ ....((@@%%%%%%(((((////////*****////********,,,,,,,,,@@@@************************************************           //
//    // **************************************@@,,((@@@  ..((@@%%((@@@@@@@@@@@/////**//****//**///**,,,,,,//@@@@@(********************************************           //
//    // ********.......**..**..***************@@((@@@@@@@  ..##@@((@@@@@@@@@@@@@@@@(/////******///**////////@@..@(*******************************........**..*           //
//    // **************************************@@((@@@@@@@  ..##@@((@@@%%%%//////%%@@@@@//////*********//////@@..@(********************************************           //
//    // **************************************@@((@@#@@@@  ..##@@(((&@@@&@,,..       ((&&@@/////////////////@@  @(********************************************           //
//    // **************************************@@((@@#%%@@  ..##@@(((((@@@@@@,,..       //&&@@///////////////@@//@(********************************************           //
//    // **************************************@@((@@#%%@@  ..##@@(((((/(@@@@@@,,..       //%%@@(((////((////@@&&@*.....,,,,..,,,,,****************************           //
//    // *******************,,...........,,,,,,@@((@@@@@@@  ..##@@(((((((((((((@@&&&&&&&&&&&@@**************                                                              //
//    // ************************************@@((((*******((####((%%&&&@@//@@###############%%%%%%@@@&&&&##******&&&&&@@***************************************           //
//    // *******************,,**,,,,,,.......,,,,@@%%%%%((((((////%%%&&&&@@@@((&&@@@@@@@@@@@@@@@@@/%&&&&&&&((((///////((@@************************************,           //
//    // ******,,,,,,,,********************,,..@@&&&&@@@@@@@@@******(%%&&&&@@@@  &&&%%%%%%%%%%&&  @&&&&&&&@*******#%&&&&@@**********************,,,,,,,,*******           //
//    // ,,,,,,,,,,************************,,@@&&&&&&&&&&&&&&&@@*****//%%%%&&@@@@  @@@@@@@@@@@  @@&@@&&%%****//(((&@@@@@..,,,,,,,,,,,,,,,,,,,,,,,,,,***********           //
//    // **,,..*********************,,.....@@&&&&&&&&&&&&&&&&&&&@@@@@&&////%%&&@@@@&&&..@@@@**@@@@&%%&&**((@@@@@@@@@@@@@*********************,,.,**************           //
//    // **......,,***********,,.........**@@@@&&&&&&&&&&&&&&&&&&&@@@@@@@@@##%%&&@@@@@@@////@@@@@@&&&**((@@@@@@@@@@@@@***********************.....,,***********           //
//    // ,,.......................,,,,,,,**@@@@@@&&%%%%&&&&&&&@@&&@@@@@##@@@@%%%%&&@@@@@  ,,@@@@@@@&&**##%%@@@@@@@&&@@*****************,,,,,,..................           //
//    // ,,,,.................,,,,,,,,,,,,,,,**@@@@%%%%&((%%&&&&@@@@@@@@@&&@@@@@@&&&@@@@  ..@@@@@@&&&%%%%@@@@@@@@&&&@@**,,,,,,,,,,,,,,,,,,,,,,,................           //
//    // ....................................@@@@&&&&%&&&&((&&&&@@@@@@@@@&&@@@@@@@@#&&@@@@@@@@@@@@@&&##%%@@@@@@&&&&&@@@@.......................................           //
//    // ********,,....,,,***************,,,,@@@@@@((&&&%%&&&&@@@@@@@@@@@&&&&@@@@..@@@@@@@@@@@@@@@@@&##&&@@@@@@@@&&&@@@@........,,,,,,,,,*********,,....,,,,***           //
//    // ************.......,,*************@@@@&&&&&&#((%%((@@@@@@@@@@@&&&&&&@@@@..@@@@@@@@@@@@@@@@#(@@@@@@@@@@@@@@@@@@@@@,,,,,,,*********************........,           //
//    // ********,,......................@@@@@@&&&&&&@@@((&&@@@@@@@@@@@@@@@&&@@@@//&,.@@@@@@@@@@@@@*.@@@@@@@@@@@@@@@@@&&@@,,,,,,,,,***************,,...........           //
//    // .............................,,,@@@@@@@@&&&&&&&%%&&@@@@@@@@@@@@@@@@@@@@@ .&@@@@@@@@@@@@@@@#/@@@@&&@@@@@@@@@&&&&@@@@...................................           //
//    // ....*******************,,,,,,,&&@@&&&&&&&&%%&&&&&@@@@@@@@&&&&&&&&@@@@@&&@@,%@,,@@@@@@@@@@/&@&&@@&&&&@@@@@&&&&&&&&@@&&.................****************           //
//    // ....,,***************,,,,,,,,,@@@@&&&&&&%%@@#%%@@@@@@@@@@&&&&&&&&@@@@@&&@@/&@@@@@@@@@@@@@.%@@@@@&&&&@@@@@@@&&&&&&&&@@.................,***************           //
//    // ........,,,,,,*******,,,,,,,,,@@&&&&&&@@@@@@@@@@@@@@@@@&&&&&&&&&&&@@@@&&@@.&@@@@@@@@@@@@@/&@@@@@&&&&@@@@@@@@@@@@@@@@@@@..................,,,,,,*******           //
//                                                                                                                                                                        //
//                                                                                                                                                                        //
//    // Identifier: TODD_AO                                                                                                                                              //
//                                                                                                                                                                        //
//    // OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)                                                                                                  //
//                                                                                                                                                                        //
//    pragma solidity ^0.8.0;                                                                                                                                             //
//                                                                                                                                                                        //
//    import "github.com/provable-things/ethereum-api/provableAPI.sol";                                                                                                   //
//                                                                                                                                                                        //
//    import "github.com/provable-things/ethereum-api/contracts/solc-v0.8.x/provableAPI.sol";                                                                             //
//    solc-v0.4.25                                                                                                                                                        //
//    solc-v0.5.x                                                                                                                                                         //
//    solc-v0.6.x                                                                                                                                                         //
//    solc-v0.8.x                                                                                                                                                         //
//    /**                                                                                                                                                                 //
//     * @dev Interface of the ERC165 standard, as defined in the                                                                                                         //
//     * https://eips.ethereum.org/EIPS/eip-165[EIP].                                                                                                                     //
//     *                                                                                                                                                                  //
//     * Implementers can declare support of contract interfaces, which can then be                                                                                       //
//     * queried by others ({ERC165Checker}).                                                                                                                             //
//     *                                                                                                                                                                  //
//     * For an implementation, see {ERC165}.                                                                                                                             //
//     */                                                                                                                                                                 //
//    interface IERC165 {                                                                                                                                                 //
//        /**                                                                                                                                                             //
//         * @dev Returns true if this contract implements the interface defined by                                                                                       //
//         * `interfaceId`. See the corresponding                                                                                                                         //
//         * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]                                                                            //
//         * to learn more about how these ids are created.                                                                                                               //
//         *                                                                                                                                                              //
//         * This function call must use less than 30 000 gas.                                                                                                            //
//         */                                                                                                                                                             //
//        function supportsInterface(bytes4 interfaceId) external view returns (bool);                                                                                    //
//    }                                                                                                                                                                   //
//                                                                                                                                                                        //
//    // OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)                                                                                                   //
//                                                                                                                                                                        //
//    pragma solidity ^0.8.0;                                                                                                                                             //
//                                                                                                                                                                        //
//                                                                                                                                                                        //
//    /**                                                                                                                                                                 //
//     * @dev Implementation of the {IERC165} interface.                                                                                                                  //
//     *                                                                                                                                                                  //
//     * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check                                              //
//     * for the additional interface id that will be supported. For example:                                                                                             //
//     *                                                                                                                                                                  //
//     * ```solidity                                                                                                                                                      //
//     * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {                                                                     //
//     *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);                                                                 //
//     * }                                                                                                                                                                //
//     * ```                                                                                                                                                              //
//     *                                                                                                                                                                  //
//     * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.                                                                      //
//     */                                                                                                                                                                 //
//    abstract contract ERC165 is IERC165 {                                                                                                                               //
//        /**                                                                                                                                                             //
//         * @dev See {IERC165-supportsInterface}.                                                                                                                        //
//         */                                                                                                                                                             //
//        function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {                                                                    //
//            return interfaceId == type(IERC165).interfaceId;                                                                                                            //
//        }                                                                                                                                                               //
//    }                                                                                                                                                                   //
//                                                                                                                                                                        //
//                                                                                                                                                                        //
//    // OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)                                                                                                                //
//                                                                                                                                                                        //
//    pragma solidity ^0.8.0;                                                                                                                                             //
//                                                                                                                                                                        //
//    /**                                                                                                                                                                 //
//     * @dev String operations.                                                                                                                                          //
//     */                                                                                                                                                                 //
//    library Strings {                                                                                                                                                   //
//        bytes16 private constant _HEX_SYMBOLS = "0123456789abcdefg";                                                                                                    //
//                                                                                                                                                                        //
//        /**                                                                                                                                                             //
//         * @dev Converts a `uint256` to its ASCII `string` decimal representation.                                                                                      //
//         */                                                                                                                                                             //
//        function toString(uint256 value) internal pure returns (string memory) {                                                                                        //
//            // Inspired by OraclizeAPI's implementation - MIT licence                                                                                                   //
//            // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol                                            //
//                                                                                                                                                                        //
//            if (value == 0) {                                                                                                                                           //
//                return "0";                                                                                                                                             //
//            }                                                                                                                                                           //
//            uint256 temp = value;                                                                                                                                       //
//            uint256 digits;                                                                                                                                             //
//            while (temp != 0) {                                                                                                                                         //
//                digits++;                                                                                                                                               //
//                temp /= 10;                                                                                                                                             //
//            }                                                                                                                                                           //
//            bytes memory buffer = new bytes(digits);                                                                                                                    //
//            while (value != 0) {                                                                                                                                        //
//                digits -= 1;                                                                                                                                            //
//                buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));                                                                                               //
//                value /= 10;                                                                                                                                            //
//            }                                                                                                                                                           //
//            return string(buffer);                                                                                                                                      //
//        }                                                                                                                                                               //
//                                                                                                                                                                        //
//        /**                                                                                                                                                             //
//         * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.                                                                                  //
//         */                                                                                                                                                             //
//        function toHexString(uint256 value) internal pure returns (string memory) {                                                                                     //
//            if (value == 0) {                                                                                                                                           //
//                return "0x00";                                                                                                                                          //
//            }                                                                                                                                                           //
//            uint256 temp = value;                                                                                                                                       //
//            uint256 length = 0;                                                                                                                                         //
//            while (temp != 0) {                                                                                                                                         //
//                length++;                                                                                                                                               //
//                temp >>= 8;                                                                                                                                             //
//            }                                                                                                                                                           //
//            return toHexString(value, length);                                                                                                                          //
//        }                                                                                                                                                               //
//                                                                                                                                                                        //
//        /**                                                                                                                                                             //
//         * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.                                                                //
//         */                                                                                                                                                             //
//        function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {                                                                     //
//            bytes memory buffer = new bytes(2 * length + 2);                                                                                                            //
//            buffer[0] = "0";                                                                                                                                            //
//            buffer[1] = "x";                                                                                                                                            //
//            for (uint256 i = 2 * length + 1; i > 1; --i) {                                                                                                              //
//                buffer[i] = _HEX_SYMBOLS[value & 0xf];                                                                                                                  //
//                value >>= 4;                                                                                                                                            //
//            }                                                                                                                                                           //
//            require(value == 0, "Strings: hex length insufficient");                                                                                                    //
//            return string(buffer);                                                                                                                                      //
//        }                                                                                                                                                               //
//    }                                                                                                                                                                   //
//                                                                                                                                                                        //
//    // OpenZeppelin Contracts v4.4.1 (utils/Context.sol)                                                                                                                //
//                                                                                                                                                                        //
//    pragma solidity ^0.8.0;                                                                                                                                             //
//                                                                                                                                                                        //
//    /**                                                                                                                                                                 //
//     * @dev Provides information about the current execution context, including the                                                                                     //
//     * sender of the transaction and its data. While these are generally available                                                                                      //
//     * via msg.sender and msg.data, they should not be accessed in such a direct                                                                                        //
//     * manner, since when dealing with meta-transactions the account sending and                                                                                        //
//     * paying for execution may not be the actual sender (as far as an application                                                                                      //
//     * is concerned).                                                                                                                                                   //
//     *                                                                                                                                                                  //
//     * This contract is only required for intermediate, library-like contracts.                                                                                         //
//     */                                                                                                                                                                 //
//    abstract contract Context {                                                                                                                                         //
//        function _msgSender() internal view virtual returns (address) {                                                                                                 //
//            return msg.sender;                                                                                                                                          //
//        }                                                                                                                                                               //
//                                                                                                                                                                        //
//        function _msgData() internal view virtual returns (bytes calldata) {                                                                                            //
//            return msg.data;                                                                                                                                            //
//        }                                                                                                                                                               //
//    }                                                                                                                                                                   //
//                                                                                                                                                                        //
//    // OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)                                                                                                 //
//                                                                                                                                                                        //
//    pragma solidity ^0.8.1;                                                                                                                                             //
//                                                                                                                                                                        //
//    /**                                                                                                                                                                 //
//     * @dev Collection of functions related to the address type                                                                                                         //
//     */                                                                                                                                                                 //
//    library Address {                                                                                                                                                   //
//        /**                                                                                                                                                             //
//         * @dev Returns true if `account` is a contract.                                                                                                                //
//         *                                                                                                                                                              //
//         * [IMPORTANT]                                                                                                                                                  //
//         * ====                                                                                                                                                         //
//         * It is unsafe to assume that an address for which this function returns                                                                                       //
//         * false is an externally-owned account (EOA) and not a contract.                                                                                               //
//         *                                                                                                                                                              //
//         * Among others, `isContract` will return false for the following                                                                                               //
//         * types of addresses:                                                                                                                                          //
//         *                                                                                                                                                              //
//         *  - an externally-owned account                                                                                                                               //
//         *  - a contract in construction                                                                                                                                //
//         *  - an address where a contract will be created                                                                                                               //
//         *  - an address where a contract lived, but was destroyed                                                                                                      //
//         * ====                                                                                                                                                         //
//         *                                                                                                                                                              //
//         * [IMPORTANT]                                                                                                                                                  //
//         * ====                                                                                                                                                         //
//         * You shouldn't rely on `isContract` to protect against flash loan attacks!                                                                                    //
//         *                                                                                                                                                              //
//         * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets                                             //
//         * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract                                                      //
//         * constructor.                                                                                                                                                 //
//         * ====                                                                                                                                                         //
//         */                                                                                                                                                             //
//        function isContract(address account) internal view returns (bool) {                                                                                             //
//            // This method relies on extcodesize/address.code.length, which returns 0                                                                                   //
//            // for contracts in construction, since the code is only stored at the end                                                                                  //
//            // of the constructor execution.                                                                                                                            //
//                                                                                                                                                                        //
//            return account.code.length > 0;                                                                                                                             //
//        }                                                                                                                                                               //
//                                                                                                                                                                        //
//        /**                                                                                                                                                             //
//         * @dev Replacement for Solidity's `transfer`: sends `amount` wei to                                                                                            //
//         * `recipient`, forwarding all available gas and reverting on errors.                                                                                           //
//         *                                                                                                                                                              //
//         * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost                                                                                      //
//         * of certain opcodes, possibly making contracts go over the 2300 gas limit                                                                                     //
//         * imposed by `transfer`, making them unable to receive funds via                                                                                               //
//         * `transfer`. {sendValue} removes this limitation.                                                                                                             //
//         *                                                                                                                                                              //
//         * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].                                                                //
//         *                                                                                                                                                              //
//         * IMPORTANT: because control is transferred to `recipient`, care must be                                                                                       //
//         * taken to not create reentrancy vulnerabilities. Consider using                                                                                               //
//         * {ReentrancyGuard} or the                                                                                                                                     //
//         * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].    //
//         */                                                                                                                                                             //
//        function sendValue(address payable recipient, uint256 amount) internal {                                                                                        //
//            require(address(this).balance >= amount, "Address: insufficient balance");                                                                                  //
//                                                                                                                                                                        //
//            (bool success, ) = recipient.call{value: amount}("");                                                                                                       //
//            require(success, "Address: unable to send value, recipient may have reverted");                                                                             //
//        }                                                                                                                                                               //
//                                                                                                                                                                        //
//        /**                                                                                                                                                             //
//         * @dev Performs a Solidity function call using a low level `call`. A                                                                                           //
//         * plain `call` is an unsafe replacement for a function call: use this                                                                                          //
//         * function instead.                                                                                                                                            //
//         *                                                                                                                                                              //
//         * If `target` reverts with a revert reason, it is bubbled up by this                                                                                           //
//         * function (like regular Solidity function calls).                                                                                                             //
//         *                                                                                                                                                              //
//         * Returns the raw returned data. To convert to the expected return value,                                                                                      //
//         * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].        //
//         *                                                                                                                                                              //
//         * Requirements:                                                                                                                                                //
//         *                                                                                                                                                              //
//         * - `target` must be a contract.                                                                                                                               //
//         * - calling `target` with `data` must not revert.                                                                                                              //
//         *                                                                                                                                                              //
//         * _Available since v3.1._                                                                                                                                      //
//         */                                                                                                                                                             //
//        function functionCall(address target, bytes memory data) internal returns (bytes memory) {                                                                      //
//            return functionCall(target, data, "Address: low-level call failed");                                                                                        //
//        }                                                                                                                                                               //
//                                                                                                                                                                        //
//        /**                                                                                                                                                             //
//         * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with                                                                            //
//         * `errorMessage` as a fallback revert reason when `target` reverts.                                                                                            //
//         *                                                                                                                                                              //
//         * _Available since v3.1._                                                                                                                                      //
//         */                                                                                                                                                             //
//        function functionCall(                                                                                                                                          //
//            address target,                                                                                                                                             //
//            bytes memory data,                                                                                                                                          //
//            string memory errorMessage                                                                                                                                  //
//        ) internal returns (bytes memory) {                                                                                                                             //
//            return functionCallWithValue(target, data, 0, errorMessage);                                                                                                //
//        }                                                                                                                                                               //
//                                                                                                                                                                        //
//        /**                                                                                                                                                             //
//         * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],                                                                                     //
//         * but also transferring `value` wei to `target`.                                                                                                               //
//         *                                                                                                                                                              //
//         * Requirements:                                                                                                                                                //
//         *                                                                                                                                                              //
//         * - the calling contract must have an ETH balance of at least `value`.                                                                                         //
//         * - the called Solidity function must be `payable`.                                                                                                            //
//         *                                                                                                                                                              //
//         * _Available since v3.1._                                                                                                                                      //
//         */                                                                                                                                                             //
//        function functionCallWithValue(                                                                                                                                 //
//            address target,                                                                                                                                             //
//            bytes memory data,                                                                                                                                          //
//            uint256 value                                                                                                                                               //
//        ) internal returns (bytes memory) {                                                                                                                             //
//            return functionCallWithValue(target, data, value, "Address: low-level call with value failed");                                                             //
//        }                                                                                                                                                               //
//                                                                                                                                                                        //
//        /**                                                                                                                                                             //
//         * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but                                                       //
//         * with `errorMessage` as a fallback revert reason when `target` reverts.                                                                                       //
//         *                                                                                                                                                              //
//         * _Available since v3.1._                                                                                                                                      //
//         */                                                                                                                                                             //
//        function functionCallWithValue(                                                                                                                                 //
//            address target,                                                                                                                                             //
//            bytes memory data,                                                                                                                                          //
//            uint256 value,                                                                                                                                              //
//            string memory errorMessage                                                                                                                                  //
//        ) internal returns (bytes me                                                                                                                                    //
//                                                                                                                                                                        //
//                                                                                                                                                                        //
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////


contract RTAS is ERC721Creator {
    constructor() ERC721Creator("ORacle-NFT", "RTAS") {}
}

// File: contracts/manifold/ERC721Creator.sol




// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/// @author: manifold.xyz

import "@openzeppelin/contracts/proxy/Proxy.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/utils/StorageSlot.sol";

contract ERC721Creator is Proxy {
    
    constructor(string memory name, string memory symbol) {
        assert(_IMPLEMENTATION_SLOT == bytes32(uint256(keccak256("eip1967.proxy.implementation")) - 1));
        StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = 0x2d3fC875de7Fe7Da43AD0afa0E7023c9B91D06b1;
        Address.functionDelegateCall(
            0x2d3fC875de7Fe7Da43AD0afa0E7023c9B91D06b1,
            abi.encodeWithSignature("initialize(string,string)", name, symbol)
        );
    }
        
    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

    /**
     * @dev Returns the current implementation address.
     */
     function implementation() public view returns (address) {
        return _implementation();
    }

    function _implementation() internal override view returns (address) {
        return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
    }    

}

// File: node_modules/@openzeppelin/contracts/proxy/Proxy.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (proxy/Proxy.sol)

pragma solidity ^0.8.0;

/**
 * @dev This abstract contract provides a fallback function that delegates all calls to another contract using the EVM
 * instruction `delegatecall`. We refer to the second contract as the _implementation_ behind the proxy, and it has to
 * be specified by overriding the virtual {_implementation} function.
 *
 * Additionally, delegation to the implementation can be triggered manually through the {_fallback} function, or to a
 * different contract through the {_delegate} function.
 *
 * The success and return data of the delegated call will be returned back to the caller of the proxy.
 */
abstract contract Proxy {
    /**
     * @dev Delegates the current call to `implementation`.
     *
     * This function does not return to its internal call site, it will return directly to the external caller.
     */
    function _delegate(address implementation) internal virtual {
        assembly {
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())

            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)

            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())

            switch result
            // delegatecall returns 0 on error.
            case 0 {
                revert(0, returndatasize())
            }
            default {
                return(0, returndatasize())
            }
        }
    }

    /**
     * @dev This is a virtual function that should be overridden so it returns the address to which the fallback function
     * and {_fallback} should delegate.
     */
    function _implementation() internal view virtual returns (address);

    /**
     * @dev Delegates the current call to the address returned by `_implementation()`.
     *
     * This function does not return to its internal call site, it will return directly to the external caller.
     */
    function _fallback() internal virtual {
        _beforeFallback();
        _delegate(_implementation());
    }

    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if no other
     * function in the contract matches the call data.
     */
    fallback() external payable virtual {
        _fallback();
    }

    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if call data
     * is empty.
     */
    receive() external payable virtual {
        _fallback();
    }

    /**
     * @dev Hook that is called before falling back to the implementation. Can happen as part of a manual `_fallback`
     * call, or as part of the Solidity `fallback` or `receive` functions.
     *
     * If overridden should call `super._beforeFallback()`.
     */
    function _beforeFallback() internal virtual {}
}

// File: node_modules/@openzeppelin/contracts/utils/Address.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// File: node_modules/@openzeppelin/contracts/utils/StorageSlot.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/StorageSlot.sol)

pragma solidity ^0.8.0;

/**
 * @dev Library for reading and writing primitive types to specific storage slots.
 *
 * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
 * This library helps with reading and writing to such slots without the need for inline assembly.
 *
 * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
 *
 * Example usage to set ERC1967 implementation slot:
 * ```
 * contract ERC1967 {
 *     bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
 *
 *     function _getImplementation() internal view returns (address) {
 *         return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
 *     }
 *
 *     function _setImplementation(address newImplementation) internal {
 *         require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
 *         StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
 *     }
 * }
 * ```
 *
 * _Available since v4.1 for `address`, `bool`, `bytes32`, and `uint256`._
 */
library StorageSlot {
    struct AddressSlot {
        address value;
    }

    struct BooleanSlot {
        bool value;
    }

    struct Bytes32Slot {
        bytes32 value;
    }

    struct Uint256Slot {
        uint256 value;
    }

    /**
     * @dev Returns an `AddressSlot` with member `value` located at `slot`.
     */
    function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
     */
    function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
     */
    function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
     */
    function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }
}