// 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: contracts/ofconceptualart.sol




// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/// @title: Etherscan Poem
/// @author: manifold.xyz

import "./manifold/ERC721Creator.sol";

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//                                                                                                                                      //
//                                                                                                                                      //
//    dP""b8 88  88    db    88b 88 .dP"Y8  dP"Yb  88b 88     8888b.   .o.    db    88   88 888888  dP"Yb  8b    d8 88b 88 888888       //
//    dP   `" 88  88   dPYb   88Yb88 `Ybo." dP   Yb 88Yb88      8I  Yb ,dP'   dPYb   88   88   88   dP   Yb 88b  d88 88Yb88 88__        //
//    Yb      888888  dP__Yb  88 Y88 o.`Y8b Yb   dP 88 Y88      8I  dY       dP__Yb  Y8   8P   88   Yb   dP 88YbdP88 88 Y88 88""        //
//     YboodP 88  88 dP""""Yb 88  Y8 8bodP'  YbodP  88  Y8     8888Y"       dP""""Yb `YbodP'   88    YbodP  88 YY 88 88  Y8 888888      //
//    88     888888 .dP"Y8     .dP"Y8    db    88b 88  dP""b8 88      dP"Yb  888888 .dP"Y8     88      dP"Yb  88b 88  dP""b8 .dP"Y8     //
//    88     88__   `Ybo."     `Ybo."   dPYb   88Yb88 dP   `" 88     dP   Yb   88   `Ybo."     88     dP   Yb 88Yb88 dP   `" `Ybo."     //
//    88  .o 88""   o.`Y8b     o.`Y8b  dP__Yb  88 Y88 Yb  "88 88  .o Yb   dP   88   o.`Y8b     88  .o Yb   dP 88 Y88 Yb  "88 o.`Y8b     //
//    88ood8 888888 8bodP'     8bodP' dP""""Yb 88  Y8  YboodP 88ood8  YbodP    88   8bodP'     88ood8  YbodP  88  Y8  YboodP 8bodP'     //
//    8888b.  888888 .dP"Y8     Yb    dP 88  dP"Yb  88      dP"Yb  88b 88 .dP"Y8                                                        //
//     8I  Yb 88__   `Ybo."      Yb  dP  88 dP   Yb 88     dP   Yb 88Yb88 `Ybo."                                                        //
//     8I  dY 88""   o.`Y8b       YbdP   88 Yb   dP 88  .o Yb   dP 88 Y88 o.`Y8b                                                        //
//    8888Y"  888888 8bodP'        YP    88  YbodP  88ood8  YbodP  88  Y8 8bodP'                                                        //
//    8888b.  888888     88        db    88   88 888888  dP"Yb  8b    d8 88b 88 888888                                                  //
//     8I  Yb 88__       88       dPYb   88   88   88   dP   Yb 88b  d88 88Yb88 88__                                                    //
//     8I  dY 88""       88  .o  dP__Yb  Y8   8P   88   Yb   dP 88YbdP88 88 Y88 88""                                                    //
//    8888Y"  888888     88ood8 dP""""Yb `YbodP'   88    YbodP  88 YY 88 88  Y8 888888                                                  //
//    88""Yb 88     888888 .dP"Y8 .dP"Y8 888888 88b 88 888888     8b    d8  dP"Yb  88b 88      dP""b8  dP"Yb  888888 88   88 88""Yb     //
//    88__dP 88     88__   `Ybo." `Ybo." 88__   88Yb88   88       88b  d88 dP   Yb 88Yb88     dP   `" dP   Yb 88__   88   88 88__dP     //
//    88""Yb 88  .o 88""   o.`Y8b o.`Y8b 88""   88 Y88   88       88YbdP88 Yb   dP 88 Y88     Yb      Yb   dP 88""   Y8   8P 88"Yb      //
//    88oodP 88ood8 888888 8bodP' 8bodP' 888888 88  Y8   88       88 YY 88  YbodP  88  Y8      YboodP  YbodP  888888 `YbodP' 88  Yb     //
//    8888b.  88   88 88b 88 888888     88        db    88b 88  dP""b8 88   88 888888 88   88 88""Yb                                    //
//     8I  Yb 88   88 88Yb88 88__       88       dPYb   88Yb88 dP   `" 88   88 88__   88   88 88__dP                                    //
//     8I  dY Y8   8P 88 Y88 88""       88  .o  dP__Yb  88 Y88 Yb  "88 Y8   8P 88""   Y8   8P 88"Yb                                     //
//    8888Y"  `YbodP' 88  Y8 888888     88ood8 dP""""Yb 88  Y8  YboodP `YbodP' 888888 `YbodP' 88  Yb                                    //
//    8b    d8  dP"Yb  88b 88  dP"Yb  888888  dP"Yb  88b 88 888888                                                                      //
//    88b  d88 dP   Yb 88Yb88 dP   Yb   88   dP   Yb 88Yb88 88__                                                                        //
//    88YbdP88 Yb   dP 88 Y88 Yb   dP   88   Yb   dP 88 Y88 88""   .o.                                                                  //
//    88 YY 88  YbodP  88  Y8  YbodP    88    YbodP  88  Y8 888888 `"'                                                                  //
//    888888  dP"Yb  88   88 888888     .dP"Y8 88   88 888888 888888  dP"Yb   dP""b8    db    88b 88 888888                             //
//      88   dP   Yb 88   88   88       `Ybo." 88   88 88__   88__   dP   Yb dP   `"   dPYb   88Yb88   88                               //
//      88   Yb   dP Y8   8P   88       o.`Y8b Y8   8P 88""   88""   Yb   dP Yb       dP__Yb  88 Y88   88                               //
//      88    YbodP  `YbodP'   88       8bodP' `YbodP' 88     88      YbodP   YboodP dP""""Yb 88  Y8   88                               //
//    888888 888888     88""Yb 88     8b    d8 888888           dP"Yb  88   88    db    88b 88 8888b.                                   //
//    88__     88       88__dP 88     88b  d88 88__            dP   Yb 88   88   dPYb   88Yb88  8I  Yb                                  //
//    88""     88       88""Yb 88  .o 88YbdP88 88""    .o.     Yb b dP Y8   8P  dP__Yb  88 Y88  8I  dY                                  //
//    888888   88       88oodP 88ood8 88 YY 88 888888 ,dP'      `"YoYo `YbodP' dP""""Yb 88  Y8 8888Y"                                   //
//    .dP"Y8  dP"Yb  88b 88 88b 88 888888     88     88  88 888888 88   88 88""Yb 888888                                                //
//    `Ybo." dP   Yb 88Yb88 88Yb88 88__       88     88  88 88__   88   88 88__dP 88__                                                  //
//    o.`Y8b Yb   dP 88 Y88 88 Y88 88""       88  .o 888888 88""   Y8   8P 88"Yb  88""    .o.                                           //
//    8bodP'  YbodP  88  Y8 88  Y8 888888     88ood8 88  88 888888 `YbodP' 88  Yb 888888 ,dP'                                           //
//     88888 888888     8b    d8 888888     .dP"Y8  dP"Yb  88   88 Yb    dP 88 888888 88b 88 .dP"Y8                                     //
//        88 88__       88b  d88 88__       `Ybo." dP   Yb 88   88  Yb  dP  88 88__   88Yb88 `Ybo."                                     //
//    o.  88 88""       88YbdP88 88""       o.`Y8b Yb   dP Y8   8P   YbdP   88 88""   88 Y88 o.`Y8b                                     //
//    "bodP' 888888     88 YY 88 888888     8bodP'  YbodP  `YbodP'    YP    88 888888 88  Y8 8bodP'                                     //
//    8888b.  888888 .dP"Y8      88888  dP"Yb  88   88 88""Yb .dP"Y8        db    88b 88  dP""b8 88 888888 88b 88 .dP"Y8                //
//     8I  Yb 88__   `Ybo."         88 dP   Yb 88   88 88__dP `Ybo."       dPYb   88Yb88 dP   `" 88 88__   88Yb88 `Ybo."                //
//     8I  dY 88""   o.`Y8b     o.  88 Yb   dP Y8   8P 88"Yb  o.`Y8b      dP__Yb  88 Y88 Yb      88 88""   88 Y88 o.`Y8b                //
//    8888Y"  888888 8bodP'     "bodP'  YbodP  `YbodP' 88  Yb 8bodP'     dP""""Yb 88  Y8  YboodP 88 888888 88  Y8 8bodP'                //
//    888888 888888      88888 888888     88""Yb 88     888888 88   88 88""Yb 888888                                                    //
//    88__     88           88 88__       88__dP 88     88__   88   88 88__dP 88__                                                      //
//    88""     88       o.  88 88""       88"""  88  .o 88""   Y8   8P 88"Yb  88""                                                      //
//    888888   88       "bodP' 888888     88     88ood8 888888 `YbodP' 88  Yb 888888                                                    //
//    888888 888888      88888 888888     8b    d8 888888 88b 88     Yb    dP    db    88 .dP"Y8                                        //
//    88__     88           88 88__       88b  d88 88__   88Yb88      Yb  dP    dPYb   88 `Ybo."                                        //
//    88""     88       o.  88 88""       88YbdP88 88""   88 Y88       YbdP    dP__Yb  88 o.`Y8b                                        //
//    888888   88       "bodP' 888888     88 YY 88 888888 88  Y8        YP    dP""""Yb 88 8bodP'                                        //
//       db    88   88     Yb    dP 888888 88b 88 888888     8b    d8    db    88   88 Yb    dP    db    88 .dP"Y8                      //
//      dPYb   88   88      Yb  dP  88__   88Yb88   88       88b  d88   dPYb   88   88  Yb  dP    dPYb   88 `Ybo."                      //
//     dP__Yb  Y8   8P       YbdP   88""   88 Y88   88       88YbdP88  dP__Yb  Y8   8P   YbdP    dP__Yb  88 o.`Y8b                      //
//    dP""""Yb `YbodP'        YP    888888 88  Y8   88       88 YY 88 dP""""Yb `YbodP'    YP    dP""""Yb 88 8bodP'                      //
//     dP"Yb  88   88 88     8b    d8 888888 8b    d8 88""Yb  dP"Yb  88""Yb 888888 888888                                               //
//    dP   Yb 88   88 88     88b  d88 88__   88b  d88 88__dP dP   Yb 88__dP   88   88__                                                 //
//    Yb b dP Y8   8P 88     88YbdP88 88""   88YbdP88 88"""  Yb   dP 88"Yb    88   88""                                                 //
//     `"YoYo `YbodP' 88     88 YY 88 888888 88 YY 88 88      YbodP  88  Yb   88   888888                                               //
//    8888b.  888888          8888b.  888888 88                                                                                         //
//     8I  Yb 88__             8I  Yb 88__   88                                                                                         //
//     8I  dY 88""    .o.      8I  dY 88""   88  .o  .o.                                                                                //
//    8888Y"  888888 ,dP'     8888Y"  888888 88ood8 ,dP'                                                                                //
//    88""Yb    db    88""Yb 888888 88 88             88        db                                                                      //
//    88__dP   dPYb   88__dP 88__   88 88             88       dPYb                                                                     //
//    88"""   dP__Yb  88"Yb  88""   88 88  .o         88  .o  dP__Yb                                                                    //
//    88     dP""""Yb 88  Yb 888888 88 88ood8         88ood8 dP""""Yb                                                                   //
//    888888 888888 88   88 88 88     88     888888     8b    d8  dP"Yb  88""Yb 888888 888888                                           //
//    88__   88__   88   88 88 88     88     88__       88b  d88 dP   Yb 88__dP   88   88__                                             //
//    88""   88""   Y8   8P 88 88  .o 88  .o 88""       88YbdP88 Yb   dP 88"Yb    88   88""   .o.                                       //
//    88     888888 `YbodP' 88 88ood8 88ood8 888888     88 YY 88  YbodP  88  Yb   88   888888 `"'                                       //
//                                                                                                                                      //
//                                                                                                                                      //
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////


contract ofconceptualart is ERC721Creator {
    constructor() ERC721Creator("Etherscan Poem", "ofconceptualart") {}
}

// 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
        }
    }
}