// File: contracts/MF.sol




// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/// @title: Mind Fuzz
/// @author: manifold.xyz

import "./ERC721Creator.sol";

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//                                                                                                                           //
//                                                                                                                           //
//    .',,,,':c'.....':,;lc'',;',;;,...;,..,:::'',;;,'';;,'.,,......','......';;;'.,::;'..',;,,'...''....'cc;lo'.;o;.;;..    //
//    :xOOkkldOOOOkl,;ldk00OkkOO0KKOdoloook0KXOkOKK0Okk0K0kl;:ll:';ldxo:;cdollooodkOO0Kkl;,:ldkxo;:k0xo;'dXXo:lc;ld:.:l,.    //
//    ckKXNXO0NWWWWKxdkXNWWX0XWNXXNXXXK0O0K0OKXXNWWNXNNXXXX0dx0KOdk00KK0Okl;;:,,oXNK0KXX0c..,oOkc,oOOOx::ldd:,dxldl,.:x:.    //
//    :xKNWWXKXNWNK0KK0XNX0OKXNXXXXKKXXXKXNNKKXXNNK00KXXNWWNNNX0KX0kkOKKKOdoddc,l0XXXXXKx;,;ldo:'';:,,.;dl',:o0dcdl,;ol,.    //
//    lkKXNNWWWWWN00XXOKNNX000XNWXKKXKXWXXNWWNKXX0k0XNXXNNXXNN0kddkO00KXXKK00Ox:';cloddc,;cc:,.',:okd:.:Ox;':kKo;;;';o:..    //
//    oKNNNNNWWNNKOKNXKKNWWXO0XXX0KNWNXNNXXXKKX0d:o0KKXXKkxxxl,',:c:cdkxddxkkkxollc;,',:lc::;,loloxxdc'ckdc,ldddcc:'',,;'    //
//    l0NKKXXXNNNNXKXXXXNNXXKXKK0k0XN0xxdollllcc:;:cc:cc,';cclccc:::;;:lcc::c::lool::;:odl;,;,cc,'cl;,'lx:cxc;ll:::;.,dkc    //
//    cdOKKXK0XWNWWNXXNNNKKNNXOdc;:cc:;;',;:;:coooodl;;ccclc;cllddloxkkddddddc;;:;..,;,;:cc:cc:;;';lc;'lkl::::lc;;::,,cdl    //
//    cokXXXXXWWWX0kxxkOkl:cc;'.....'',,.';;;,'....;,',cdxxolclodxkkdl;....,:cloool:,,,,,..;cllcccokxl,:c'..;c:::;;;coldd    //
//    :odkOXWWNWKkc'';cll:'....';:clodxkkkOOOkkxollc;,....,::::::;'...':ldOKXNNWWWWNOdlcoxkkO00OkkOOd:,;,,cc:'.lxlcdxdxOc    //
//    llccoKNXXXKd'.;;,,,,,;ldkO0KKKK00XNWN0OOOO0XNXXK0Okxollccc:codkOKXXXXXKK000KXNWWNKOOOOOxdxkOkdlcd0Okkdc,cxOOxk0O0Oc    //
//    oocod0XKKXO:....';coxkkkkkkkko:ckXWWKxlllodxkOkO0KXNNWWWNNNXXK00kdddooolcc::oxk0XNNXXKd;,,,;cllldKN0k0K0OXWNK0K0kdd    //
//    dxodxOXKxl;..'cxOOkxkOKXNNNK0OOKK00KXK00KKXXKd,.,cccldxkxddlllcc:;:cldd:....',,:dk00kl......,locdXNXKKXKk0K0dddc;ll    //
//    cooxKX0o;,.'lk0kdk0XWWNXK00O0000O0KXNWWWWWWWXd;;clc:ccclooolcclodxOKNNO;...;ldc,,:ll,.......,llo0XKKKKKK0ko:,:ol;;,    //
//    oxd0KOo,,';dkkocdKXKK00OkxkOO0KXNXXXNNNNNNNNKkdodkxO00OkdoodkOKXWWWWWk,...:0NK0k:,::,'......'cxKWKdllodOKXOoldxooko    //
//    lxKXo;'..;odddddxkOOOOOO0KXNWWXKKOOKNXXXXXXKOl'.dK0k0Oxx0KXWWWWWWWWWXc...cONXl;ol;ldk0Odl,..'o0NNO;'collokKXOl,,cl,    //
//    lxX0:',.,looodxOO00OO0XWWWWWWN0kkk0NNXXKKXXXKo.'kWWkloONWWWWWWWWWWWNx'...dNWWk,..'o0OXWWKc..'oOOK0c..',,',lOXOooddc    //
//    oxOx,...;llodkKK000KKXXXNNNNX0ddk0XNXX0OKXKXXOc,oNXxlxNWWWWWWWWWWWWk'....:KWNo...'o0xoxko;;:ckKX00x'.......:OX0kxo;    //
//    oddo'..';coxkOK00KKXNNXXXXK0kddOKXNXNKxkKXXNWNX0OK0OOx0XNWWWWWWWWNO:....,dKOc....:x0o...,cocckK0dko.........lKKOkdl    //
//    ldkk,.';codoollloddx0XNXXKOddx0XXXXNXkdOXNWWWNKKNWXXXX0kkkkOOOKX0l....'dX0l....'cdkx;...,ok:'cookOc...';cl:.;OXdcll    //
//    ldOO;.',;,,'.,c:..,:coxkxdxxOKXXKXWN0dxKXNNNXOkKNNXO0WWN0OOOOOOkdlcc::lxOxlcclok0Ol,....'oOd''lONKc'.,:ldkOocOKl.',    //
//    cdOOc.;;';,,,dXx'....',clcoxO00KKXNKxdO00XNX0kONWNOx0NWNK0OOXWXKKKOOKXK000OOKXNNKo,......:kOodKNNO:.':okOOKKKKk;.,,    //
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//    cdO0kd;,::;,'lOolc:xxko;,...'',,;::loxk0K00kxOXXKOxOXNNKOkdldO0K0OkKWWNKOKXNWWNX0kkkxxdxkOKKXWX00x,.,:okOkOXNO:cxkl    //
//    xddOkolox0koooocc::dxxllo:;;,',,..','',::ccccdxddddxOOkdolc::cxOOxOKKK0OOkO0O0KXXXKK0kxdOKxo0WKokNx;:xOOkkOXKllkodo    //
//    lx0K000xdxlccc:;,,oko:dOxllxx;:o,.:c,,'..','',;;;;;;::;,'.'...':lclolc:::,;::;cldOKNWNK0XO;;x000XNd:ld:lxkKKdlxodKd    //
//    ;kKKKkdodl:'.'.',';l:,coclodo;oOd:dd,coc:;'',,'':c'';:,.........................';lx0XWWWKdoxkO00d:c:'.cOKXx;odcONx    //
//    :dOXXO:',:,,,..;:,';:loldkxc;ckKOcoooo::o:.,;:,:o;.;xl:;...........................':okKNX0kdlcc;,co;.'dKXO::dc:d0x    //
//    cd0KKXd;:c,,;..';::lolocccc::lodxl,':cclc,,ll:,,ldlod:':c;;'..................,,;;....,cdkOkddoc;;cdo;l0Xk:,lo;,oOl    //
//    ldk0kl,..'co;...;looc;::cclloolccc:;,',,,',;;;:dO0koooccc:cc:,...............;:'';,.....'';cx0XX0OO0KK00x;.;oocx0O;    //
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//    oxONNXk,'cdd;.'.,ccc:;,cOKWWWWWNXKKx:looloc,'';d0K0kdccoc,'...';'.'....',;;lo'..........';c,,oOOOkdc::;'..;;:lkN0c.    //
//    cdx0XKd,.;:;.':':oc::';kKXWWWWWWNXKkolccddc:codolxkxc,,:c;,''',::'.........:d;............:::ddll:,'.....';,;lx0xl;    //
//    lxodOKk;.;oc..,:dOocldOKXNWNXK00OOxl::okOdlcxKOl'.;c;;;;,,,.',;:;..........,d:...........;loxd:'........'':c:lxxodo    //
//    :od0XK0c'oKd''lkKXkx0KKKKK0kl::clc:cdOO0XKo;cdoc;..'',,'....................cc..........clcdo,........'',cxc,dklcdl    //
//    :d0NNX0koc:;..l0KOdlxOkdlclollodxxOKXXddOdc;;;',;,..........................:xkkkxdl;'.,d:,c'........',,clc;,olclc'    //
//    ,ld0NXdcdd:,':dOxc;:lc:;::;,:xKNOldKXKkll:ll;,;::,......................;dk0XNWNXKXNXOdloc'....'''..:xOxkxo;,:;:kx'    //
//    :dodKXkc,cdl;:llc;;:,;dOKKx:dKNKxll::cc;;;;,,;,'......................:OXNNXXXNKK00KK00K0xoc,..','..oOOO0KKl';oOXd.    //
//    l0Kxk00k:.''',cxdc:lkkolO0d:clolodc;loc;'...............,:'...,,.....c0NNXXXXXXXKKKKKKKKKXNWO;,oOx,.'c::odo;:kXNKo'    //
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//    ,kKOO00dc:lk0XK0kx0NKOkxxxolodxkdlccldoc::cdkkkxkk0KXXXNXXK000OkkkO00Okdl;'...........,:'.lko,.c0NX0kddO0xxxdkkkOl.    //
//    'd00KNKdol;;ldxkO0KK0kkooxdxxdxOxxkxdxkkkkxxk0KKNX000KKXXKKKKK0OOxxxxlccll;.........'lkl'cOo:dOKNN0oodxOxdkkdol:l:.    //
//    :k0XNXXkolc,,,;:cldxk00Okxllc;cl;;lc:ddcodo:l0XWWXXNNXXXXNX00Okxddlcc;,'.....,::'.'';locck0dOWWNOo:lkdokkdol::lodo.    //
//    lOOXWXOo:;:::'',,'';:ldxOK0OOkkkxxdolllcoxxk0XNWWWWWX00KKK0kkkdolc;,''.....cxO0kdxO0kccook00XNKk:,;cooddc;:d0KKOko'    //
//    cxkXN0xl::,'od:oo:,'.',:codxkkkOOOkkxdxxxxkOO0KKXNNWKOkdddooccc:;,.......;x00OKKOkk0kdxxxkOO0Oo::;;lxd:;lOKXXXNOko.    //
//    'oO0X0kl,,''dOdkocc;,,'..',:ldoclcccc:cc:cllodxkxk0Okdlc;;;;,''...'',,',oO0kxkkxxOKXOodk0NKkdlc:;cxk:,;cokKNWN0kOl.    //
//    'oO00K0Oxd:lOdldoclccll:,..',,'''''''',''',;;,,;:;:::;''.........,clooldOOkxxxxOKXXOxkXNNWXxokOooko'.;ol,,dKNWOkk;.    //
//    'd0X0OXX0doxdldxkdoxxkxolclooc,;::;;,'....''''.............,;,;oodkxkxxdldxxxokKX0kod0NWWNKxdkxkx:'';',cl:o0NKO00l.    //
//    'lOK0OKOolddxO00Oxdk0K0koccooclcoxkxddoolcllccccc;',;;codddlcccxdd00Oxxxloxdocd0OodKNNWWN0xddxOx:lxo:,:odokXKO00d:.    //
//    'lkOOkocoxOO0000Okxk0000Oxl:coxoldkkxOkxkxxkxxxdlclllldxxkxlokOOl,dOOOkxodkdllddodxO0NWNKOkkkOd:oKNNKkkO0XX00XXkc'.    //
//    .ckxlclxkOOOOOO0OkkO00OOOOkdlldxolddddlcoodkxxxocllcoolxxoc:okkxccxXKkOkdkOdolldOxllokXKxdkkOo;dKXKXNNNNKK000kxl::'    //
//    'odclx00000OOOO0kxdx000OOOOOkdodooxdddc:lddllooooccdo:ldc;,;oxdlccdOkO00O0Odxo;od:oxoxXKdodkd,lKXXK0OOO0OOXKocccdl.    //
//    .,;coddddooollcc:;,,:::;;;;;;,,'',,;:c:;:c:::ccllcl:,,:,'',;,,,,',clloxdxxddxc'',:oo:lddOxod:,okkkkxkOX0oll:;:clo:.    //
//    ........................................................................''.,,..........;oc'.'',;::::;coc'..........    //
//                                                                                                                           //
//                                                                                                                           //
//                                                                                                                           //
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////


contract MF is ERC721Creator {
    constructor() ERC721Creator("Mind Fuzz", "MF") {}
}

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (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 overriden 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 internall 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 overriden should call `super._beforeFallback()`.
     */
    function _beforeFallback() internal virtual {}
}

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)

pragma solidity ^0.8.1;

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

        return account.code.length > 0;
    }

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

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

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

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

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

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

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(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) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(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) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason 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 {
            // 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

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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) {
        assembly {
            r.slot := slot
        }
    }

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

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

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