// File: contracts/TCFS.sol




// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/// @title: Cool Frogs
/// @author: manifold.xyz

import "./manifold/ERC721Creator.sol";

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//                                                                                                                                                              //
//                                                                                                                                                              //
//    ::::::.:^^~^:::::..::::::::..:::::::.:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::    //
//    ::::::JBGPPB?.:.:~~:..:::::~!^:.:::^7:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::    //
//    :::::5&7:::::::~#BPBP!:::^##PBB?::.J@~::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::    //
//    ::::^&P.:::::::G&^.^Y&P:.P&^.:?&B^.J&~::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::    //
//    :::::P&~.::::::##:::.?@!.G&^.:.!@J.J@!::::::::::::::::::::::::::::::::::::::::::::::::::::::::::^^^:::::::::::::::::::::::::::::::::::::::::::::::::::    //
//    :::::^G&Y^:^^::7&P^:~#B^:~&B!^~B#^.J@~:::::::::::::::::::::::::::::::::::::::::::::::::::::^:::.:^::::::::::::::::::::::::::::::::::::::::::::::::::::    //
//    :::::::!PGGGP^::~PGGBY::::^YGGBY:::7#~:::::::::::::::::::::::::::::::::::::::::::::^^::^^^:......:^::^^:::::::::::::::::::::::::::::::::::::::::::::::    //
//    :::::::::::::::::::::::::::::::::::::::::::::::::::::::^~^:::::::::::::::::::::::::^:.............:::^:.::^:::::::::::::::::::::::::::::::::::::::::::    //
//    :::::::::::::::::::JBPPPGY:::!PGG?::::?5Y7^::::7YY^::~GBPG?:::::::::::::::::::::::^:...::^^~^^^^^^^::.....:^::::::::::::::::::::::::::::::::::::::::::    //
//    :::::::::::::::::::5@P55PJ::^&B~5@?::J&5?B#!:^B#J!:::Y@Y~~::::::::::::::::::::::^^::~~^^:........:::^~~~:..:^:::::::::::::::::::::::::::::::::::::::::    //
//    :::::::::::::::::::5&J77?!::~&##&5:::#&:.^&B.Y@~:??^::J5P#G^:::::::::::::::::::^^.^7.  .^~~~^^^~~~~^   :7~.:^:::::::::::::::::::::::::::::::::::::::::    //
//    :::::::::::::::::::P&^::::::~&5~BB!::Y&Y~J&5:?&GJG@B::^~!##^:::::::::::::::::::^:.~7   ~?:........:?~   :?..^^:::::::^^~~^^^::::::::::::::::::::::::::    //
//    :::::::::::::::::::?P^::::::^P!:^YY:::7PGP7:::^JP5J~::JPPY^::^7Y5G####BG5J~^:::^:..~!^..:^~~~~^^~~^: ..^7^.:^:::^7YGB&&&&&&&#BPJ!^::::::::::::::::::::    //
//    :::::::::::::::::::::::::::::::::::::::::::::::::::::::::.^YB&@@&&#BB##&@@&&G?~:^:...^~~~^^^^^^^^^^^~~^:...:::!P&@@&&#GPPPGB#&@@@&G!::::::::::::::::::    //
//    ::::::::::::::::::::::::::::::::::::::::::::::::::::::::^5&@@&G?!~^^^^^~7YG&@@&P^:^::....:::::::::::...:::::7G&@&BJ!~^^^^^^^^~7JB&@&B?::::::::::::::::    //
//    :::::::::::::::::::::::::::::::::::::::::::::::::::::::!#@@#J~:^~~~^^^~~!~^~Y&@@#!:^^^^::::::::::::::^^^^:^P&@&G7^^~!!~^^^^~~~^:^!P&@&B~::::::::::::::    //
//    ::::::::::::::::::::::::::::::::::::::::::::::::::::::^#@&#~^~YGGBBG7YBBBBBJ^~G&@&!::::::^^^^^^^:^:::::::^G@&&?^^~PBBBGG7YGBGBP?^^^7#&@#~:::::::::::::    //
//    ::::::::::::::::::::::::::::::::::::::::::::::::::::::7&&&?^^5#GGGB#G#GGGGG#!^^G&&&~:::::::::::::::::::::?@&&?^^^5#GGGGBBG#GGGG#!^^^7&&@J:::::::::::::    //
//    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^:Y@&&~^^7#GGGG#G#BGGGBB^^^7&&&Y!77!!77!77!!77777777!B&&#^^^^?#GGGG#GBBGGGBB^^^^^#&@G:^^^^^^^^^^^^    //
//    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^:5@&&~^^^Y#GGGB##BGGG#?^^^!&@&@@@@@@@@@@@@@@@@@@@@@@@&@&!^^^^P#GGG###GGGBB!^^^^^#&@P:^^^^^^^^^^^^    //
//    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^:J@&&?^^^~##BGGB#GGBP!^^^^^7JJJYYYYYJJJYYYYYYJYJJYYYJYJ?~^^^^^JGBGB#BGB#&5^^^^^~&&@5:^^^^^^^^^^^^    //
//    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^!&&&5^^^Y#G?GBGG##!^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^Y&BGGB5J##~^^^^Y@&&!^^^^^^^^^^^^^    //
//    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^:P@&#^^^JBP^!&#BP#J^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^~G#P#&G:!BG~^^^^#&@G^^^^^^^^^^^^^^    //
//    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^7&&&Y^^^^^^Y&5^J#Y^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^~BB~!B#~^^^^^^!#&@#~^^^^^^^^^^^^^^    //
//    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^P&&&5~^^^^7P7^^~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^~~^^55~^^^^~J&@@B~^^^^^^^^^^^^^^^    //
//    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^J#&@#5!!^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^!P&&@&5^^^^^^^^^^^^^^^^^    //
//    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^!B&&@&&G^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^~P#&@&&5~:^^^^^^^^^^^^^^^^^    //
//    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^~?5#&&&&&BP7^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^!#&&&@&BY!^^^^^^^^^^^^^^^^^    //
//    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^7P&@@&B5?7~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^~!?5#@@&BY!^^^^^^^^^^^^^^    //
//    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^7G&@&#Y!^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^~7P&@@&P~^^^^^^^^^^^^    //
//    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^5&@&B?^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^~J#@@#7^^^^^^^^^^^    //
//    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^P&&&J^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^~P&&&Y^~~~~~~~~~    //
//    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^J&&&?^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^P&&&?^~~~~~~~~    //
//    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~#&&G^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^!!^^^^^^^^^^^^^^^^^^^^^^^^^^B&&#~~~~~~~~~    //
//    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~?&&&?^^^^^^^^^^^^^^^^^^^^^^^^^^^^~^^^^^^^^^^^^^^^^^^^^^^^^^^~75B5^^^^^^^^^^^^^^^^^^^^^^^^^^7&&&?^~~~~~~~    //
//    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~?&&&7^^^^^^^^^^^^^^^^^^^^^^^^^^^^Y55?~J^^?!!!?~^^^^^^7?~^!~~5#Y~~^^^^^^^^^^^^^^^^^^^^^^^^^^~#&&P~~~~~~~~    //
//    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~!&&@Y^^^^^^^^^^^^^^^^^^^^^^^^^^^^^7GPPB5YGBY5BPY?5Y?5PBG5BG5J7!^^^^^^^^^^^^^^^^^^^^^^^^^^^^^#&&B~~~~~~~~    //
//    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~#&&G^^^^^^^^^^^^^^^^^^^^^^^^^^^^^~!^~J7~!7^~7~7P#BY7^7~~!J!^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^~&&@P~~~~~~~~    //
//    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~P&&&7^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^~~!^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^5&&&7~~~~~~~~    //
//    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~!#&&#!^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^~G&&&5~~~~~~~~~    //
//    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~7#@@#?^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^~J#@@&J~~~~~~~~~~    //
//    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~!G&@&#Y7^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^~!?5#@@&P7~~~~~~~~~~~    //
//    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!~~7P#&@&#PJ!^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^~!7?J5B&&@@&#P7~~!!!!!!!!!!!    //
//    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!~~!?G#&@@&#GY?!~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^~!!755PB#&&@@@&&#BPY7!~~!!!!!!!!!!!!!    //
//    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!~~!7JP#&&@@&&&##BB##BGGP55YJJ5J~^^^^^^^^^^^^^^^^^^^^^^^~5BB#&&&@@&&#BGPYJ?7!~~~!!!!!!!!!!!!!!!!!    //
//    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!~~!!?J5PGB##&@@&&&&&&&@&@@&7^^^^^^^^^^^^^^^^^^^^^^^!#@&&&#BB&&B5?!~~~~!!!!!!!!!!!!!!!!!!!!!!    //
//    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!~~~7YG##BGP555P#&&@&Y!^^^^^^^^^^^^^^^^^^^^^^^^^~5&&&&BP55GB##BPJ7!~!!!!!!!!!!!!!!!!!!!!    //
//    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!75#&#GP5YYY5PB&&&#5G!^^^^^^^^^^^^^^^^^^^^^^^^^^!5?JB&&&&G5Y55PB##BP?!!!!!!!!!!!!!!!!!!!    //
//    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!5&#G5YY55Y5G&&&&&J~^!5~^^^^^^^^^^^^^^^^^^^^^^^~JY!^^^7&&&&&G5Y5Y55G#&BY!!!!!!!!!!!!!!!!!    //
//    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!G&GYY5555YG&&&&&&5^^^^!P~^^^^^^^^^^^^^^^^^^^^~?Y7^^^^^Y&#&&&&&G55555YP&&J!!!!!!!!!!!!!!!!    //
//    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!P@#Y5555Y5#&&&&##&J^^^^^!57^^^^^^^^^^^^^^^^~7YY7^^^^^^Y&####&&&&#PY55Y5&@G!!!!!!!!!!!!!!!!    //
//    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!B&&B5YYYG&&&&&#####~^^^^^~?5?~^^^~JJJ7^~!?JJ?~^^^^^^~P&#######&&&&B5PB&&&G!!!!!!!!!!!!!!!!    //
//    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!5&&&&#B#&&&&###&&&&#55YY!^^~!?JJ?BJ~7BJJ?!~^^^7J??7J#&#####&&&&&&&&&&&&&&J!!!!!!!!!!!!!!!!    //
//    77777777777777777777777777777777777777777777777777777777777!7#&##&&&&&&&&&&&&&&&&&#GP^^^^^^~~?JJY7^^^^^^^^BP#&&&&&&&&&&&&&&&######&&P!7777777777777777    //
//    777777777777777777777777777777777777777777777777777777777777!J&&###################PB^^^^^^^^^^^^^^^^^^^^?B5&####################&&P!77777777777777777    //
//    7777777777777777777777777777777777777777777777777777777777777!Y&&#################&PB^^^^^^^^^^^^^^^^^^^^BPG&###################&&&J!77777777777777777    //
//    7777777777777777777777777777777777777777777777777777777777777!P&&&################&G#7^^^^^^^^^^^^^^^^^^YB5&###################&&&&#?77777777777777777    //
//    77777777777777777777777777777777777777777777777777777777777775&&&&&&##############&BG&PJ7!!~~~~~~~!!?J5G&5B&#################&&&#&&&#77777777777777777    //
//    777777777777777777777777777777777777777777777777777777777777?&&&&#&&&###############P&BB5PPGPYBPPBGBGGBG#5&##################&&##&&&&57777777777777777    //
//    777777777777777777777777777777777777777777777777777777777777B&&&####&##############&P&GGPGYPGPGYG55G5G5BGB&#######################&&&&?777777777777777    //
//    77777777777777777777777777777777777777777777777777777777777?&&&&###################&GG#BPGPG5GYP5YG55Y5#P&#########################&&&P777777777777777    //
//    777777777777777777777777777777777777777777777777777777777775&&&&#####################P&G5GPG5B5PJP??GYGGB&#########################&&&#777777777777777    //
//    77777777777777777777777777777777777777777777777777777777777#&&&#####################&GB#5P55Y5PPGPPGJ5#5&#########&&&##############&&&&J77777777777777    //
//    7777777777777777777777777777777777777777777777777777777777?&&&&###########&&&&######&#5&5YPPG5P55PGGP#PG&#########&&&&##############&&&577777777777777    //
//    7777777777777777777777777777777777777777777777777777777777P&&&############&&&########&PB&GJY5GPGPBB#&#5&###########&&&##############&&&G77777777777777    //
//    7777777777777777777777777777777777777777777777777777777777B&&&###########&&&&########&#5&&BBY5GGGB#&&PB&###########&&&&#############&&&B77777777777777    //
//    777777777777777777777777777777777777777777777777777777777?&&&&###########&&&&#########&PB&#&#GJ5#&#&B5&############&&&&#############&&&&?7777777777777    //
//    777777777777777777777777777777777777777777777777777777777J&&&&##########&&&&##########&#5&###&#####&5#&############&&&&#############&&&&?7777777777777    //
//    7777777777777777777777777777777777777777777777777777777775&&&###########&&&&###########&BG&#######&GG&#############&&&&#############&&&&J7777777777777    //
//    ????????????????????????????????????????????????????????7G&&&##########&&&&#############&PB&#####&#P&##############&&&&#############&&&&?7????????????    //
//    ????????????????????????????????????????????????????????7B&&&##########&&&##############&#5&#####&P#&##############&&&##############&&&#??????????????    //
//                                                                                                                                                              //
//                                                                                                                                                              //
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////


contract TCFS is ERC721Creator {
    constructor() ERC721Creator("Cool Frogs", "TCFS") {}
}

// 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
        }
    }
}