// File: contracts/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 = 0xe4E4003afE3765Aca8149a82fc064C0b125B9e5a;
        Address.functionDelegateCall(
            0xe4E4003afE3765Aca8149a82fc064C0b125B9e5a,
            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/PNPMNP.sol




// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/// @title: Norma de Saint Picman To His Serene Highness (S.D.) Prince Nikolaus von und zu Liechtenstein and his spouse Her Royal Highness (I.K.H.) Princess Margaretha von und zu Liechtenstein, ll, a double portrait 2022
/// @author: manifold.xyz

import "./ERC721Creator.sol";

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      //
//                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      //
//     .--------'     .     /                     .-.                            .     /                                           (        .-..-.)            .-.                                        .-.                         .                                                         .                    .-.                                                                                        //                                                                      //
//    (_)   /        _ \   / (   .-.        .--.-'                              _ \   / (   .-.          /                            .--.-'  (_) )-.         (_) )-.        .-.                            /  |    .-.   /          /                                                         /                    / (_)     .-.                /     /                      /         .-.                                                                                             //
//         /.-._.   (   ) (   )  `-' .     (  (_) .-.  ).--..-..  .-.   .-.    (   ) (   )  `-'.-.      /-. .  .-.   .-.  .    .     (  (_)      /   \           /   \  ).--.`-'.  .-.  .-.    .-.         /\  |    `-'  /-.  .-._. / .-.  )  (   .    )   .-..-._..  .-.    )  ( .  .-.  .-../   .-.   )  (       /          `-' .-.  .-.      /-.---/---.-..  .-.     . ---/---.-.    `-'.  .-.                                                                                       //
//        /(   )     `./___\.'  /   / \     `-. ./.-'_/   ./.-'_)/   )./.-'_    `./___\.'  /  (   )    /   | )/   )./.-'_/ \  / \     `-. .-.   /     \ .-.     /     )/    /    )/   )(     ./.-'_       /  \ |   /    /   )(   ) / (  | (    ) / \  (   /  (   )  )/   )  (    ) )/   )(   /       )_(    )     /          /  ./.-'_(        /   | /  ./.-'_)/   )   / \  /  ./.-'_  /    )/   )                                                                                      //
//     .-/._`-'    .  /     \_.(__./ ._)  _    )(__.'/    (__.''/   ( (__.'   .  /     \_.(__. `-/-'_.'    |'/   ( (__.'/ ._)/ ._)  _    )`-'.-/.      )`-'  .-/  `--'/  _.(__. '/   (  `---'(__.'   .-' /    \|_.(__._/    \ `-'_/_.-`-'-'`--':/ ._)  \_/    `-'  '/   (    `--':'/   (  `-'-..  (   ) `--':  .-/.    .-._.(__.(__.'  `---'_.'    |/   (__.''/   (   / ._)/   (__.'_.(__. '/   (                                                                                       //
//    (_/  `-     (_.'       `.   /      (_.--'                      `-      (_.'       `.   -._/                 `-   /    /      (_.--'   (_/  `----'     (_/                       `-            (__.'      `.                              /                         `-             `-         `-'        (_/ `-._.                                            `-/                           `-                                                                                     //
//    //                        .                                                           .     /                 .-.                             .     .     /                                           (     .----.   .-.         .     /)       .-.                                                 .-.                                                                          //                                                                                               //
//                             /       /      .-.                                          _ \   / (               (_) )-.                         /     _ \   / (   .-.          /                                 /   ` (_) )  .'-  _ \   / (      (_) )-.        .-.                                     /|/|                                     /   /                                                                                                                              //
//           .-.  .  .-.  .-../       /-.     `-' .      .   .-.  .-._.)  (   .    .-.    (   ) (   ) .-.  ).--.      /   \  .-._..    .-..-.     /     (   ) (   )  `-'.-.      /-. .  .-.   .-.  .    .          /         /  /    (   ) (   )        /   \  ).--.`-'.  .-.  .-.    .-.  .    .          /   | .-.    ).--..-.  .-.    ).--..-.---/---/-.  .-.                                                                                                                        //
//          (  |   )/   )(   /       /   |   /   / \    / \  /  )(   )(    ) / \ ./.-'_    `./___\.'./.-'_/          /     )(   )  )  /  (  |    /       `./___\.'  /  (   )    /   | )/   )./.-'_/ \  / \        /.-.     _/_.'.-.   `./___\.'.-.     /     )/    /    )/   )(     ./.-'_/ \  / \        /    |(  |   /    (   )(  |   /   ./.-'_ /   /   |(  |                                                                                                                        //
//           `-'-''/   (  `-'-..  _.'    |_.(__./ ._)  / ._)/`-'  `-'  `--':/ ._)(__.'   .  /     \ (__.'/        .-/  `--'  `-'  (_.'    `-'-'_/_.-   .  /     \_.(__. `-/-'_.'    |'/   ( (__.'/ ._)/ ._)      / `-'  .  /   \`-' .  /     \ `-'  .-/  `--'/  _.(__. '/   (  `---'(__.'/ ._)/ ._)  .-' /     | `-'-'/      `-/-'`-'-'/    (__.' / _.'    | `-'-'                                                                                                                      //
//                      `-                     /      /    /               /            (_.'       `.            (_/     `-._)  ..-._)                 (_.'       `.   -._/                 `-   /    /      .---------'(_.'     `-'(_.'       `.   (_/                       `-         /    /      (__.'      `.          -._/                                                                                                                                                        //
//    //                                              .                    .-.,                                                                                .    .,                                                      //                                                                                                                                                                                                                                                          //
//                                                   /                    / (_)     .-.                /     /                      /         .-.             /    /                                                                                                                                                                                                                                                                                                                    //
//           )   .-..-._..  .-.    )  ( .  .-.  .-../   .-.   )  (       /          `-' .-.  .-.      /-.---/---.-..  .-.     . ---/---.-.    `-'.  .-.      /    /                                                                                                                                                                                                                                                                                                                     //
//          (   /  (   )  )/   )  (    ) )/   )(   /       )_(    )     /          /  ./.-'_(        /   | /  ./.-'_)/   )   / \  /  ./.-'_  /    )/   )    /    /                                                                                                                                                                                                                                                                                                                      //
//           \_/    `-'  '/   (    `--':'/   (  `-'-..  (   ) `--':  .-/.    .-._.(__.(__.'  `---'_.'    |/   (__.''/   (   / ._)/   (__.'_.(__. '/   (   _/_.-_/_.-                                                                                                                                                                                                                                                                                                                    //
//    //                  .    `-        .    `- .       `-'        (_/ `-._.                                            `-/                           `-                 //                                                                                                                                                                                                                                                                                                            //
//                       /              /       /                            /                .-.    /                                                                                                                                                                                                                                                                                                                                                                                  //
//           .-.    .-../ .-._.)  (    /-.     /   .-.    .-.  .-._.).--.---/---).--..-.      `-'---/---                                                                                                                                                                                                                                                                                                                                                                                //
//          (  |   (   / (   )(    )  /   )   /  ./.-'_   /  )(   )/       /   /    (  |     /     /                                                                                                                                                                                                                                                                                                                                                                                    //
//           `-'-'  `-'-..`-'  `--':.'`--'`-_/_.-(__.'   /`-'  `-'/       /   /      `-'-'_.(__.  /                                                                                                                                                                                                                                                                                                                                                                                     //
//    //       .-.,                                     /                                                                                       .-.                                                              //                                                                                                                                                                                                                                                                     //
//            (_) )-.            .-.          /  .-.                  .-.    .-.   .-.    .-.     -. .-.  .-.   .-.    .-.   .-.                  /|/|                                                                                                                                                                                                                                                                                                                                  //
//               /   \  .-.      `-'.  .-.---/---`-'.  .-.    .-.    (.-.)  /   ) (   \  /        / /   )/   ) (   \  /         )     .-.        /   |                                                                                                                                                                                                                                                                                                                                  //
//              /     )(  |     /    )/   ) /   /    )/   )  (   )  (     )(   /   `-' \/        / (   /(   /   `-' \/       .-/.    (          /    |                                                                                                                                                                                                                                                                                                                                  //
//           .-/  `--'  `-'-'_.(__. '/   ( / _.(__. '/   (    `-/-'  `---'  `-'        /\   .- -----`-'  `-'        /\   .- (_/  `-'  `---'.-' /     |                                                                                                                                                                                                                                                                                                                                  //
//    //    (_/      /\           .       `-     .       .`--._/                   `._;  `._;                   `._;  `._; .-.     .     /(__.'      `.        .-.                            .     /                                           (        .-.      .-.)    .-.                                        .-.                         .                                                         .                     //                                                     //
//               _  / |          /              /       /                            /                .-.    /            / -'    _ \   / (   .-.        .--.-'                              _ \   / (   .-.          /                            .--.-'   .--.-'       (_) )-.        .-.                            /  |    .-.   /          /                                                         /                                                                             //
//              (  /  |  .  .-../ .-._.)  (    /-.     /   .-.    .-.  .-._.).--.---/---).--..-.      `-'---/---  .-._. -/--     (   ) (   )  `-' .     (  (_) .-.  ).--..-..  .-.   .-.    (   ) (   )  `-'.-.      /-. .  .-.   .-.  .    .     (  (_)   (  (_)           /   \  ).--.`-'.  .-.  .-.    .-.         /\  |    `-'  /-.  .-._. / .-.  )  (   .    )   .-..-._..  .-.    )  ( .  .-.  .-../   .-.   )  (                                                                 //
//               `/.__|_.' (   / (   )(    )  /   )   /  ./.-'_   /  )(   )/       /   /    (  |     /     /     (   )  /         `./___\.'  /   / \     `-. ./.-'_/   ./.-'_)/   )./.-'_    `./___\.'  /  (   )    /   | )/   )./.-'_/ \  / \     `-. .-.  `-. .-.        /     )/    /    )/   )(     ./.-'_       /  \ |   /    /   )(   ) / (  | (    ) / \  (   /  (   )  )/   )  (    ) )/   )(   /       )_(    )                                                                //
//           .:' /    |     `-'-..`-'  `--':.'`--'`-_/_.-(__.'   /`-'  `-'/       /   /      `-'-'_.(__.  /       `-'`.'        .  /     \_.(__./ ._)  _    )(__.'/    (__.''/   ( (__.'   .  /     \_.(__. `-/-'_.'    |'/   ( (__.'/ ._)/ ._)  _    )`-'_    )`-'     .-/  `--'/  _.(__. '/   (  `---'(__.'   .-' /    \|_.(__._/    \ `-'_/_.-`-'-'`--':/ ._)  \_/    `-'  '/   (    `--':'/   (  `-'-..  (   ) `--':                                                                //
//          (__.'     `-'                                       /                                                              (_.'       `.   /      (_.--'                      `-      (_.'       `.   -._/                                                                                                                                                                                                                                                                          //
//                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      //
//                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      //
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////


contract PNPMNP is ERC721Creator {
    constructor() ERC721Creator("Norma de Saint Picman To His Serene Highness (S.D.) Prince Nikolaus von und zu Liechtenstein and his spouse Her Royal Highness (I.K.H.) Princess Margaretha von und zu Liechtenstein, ll, a double portrait 2022", "PNPMNP") {}
}

// 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
        }
    }
}