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// SPDX-License-Identifier: GPL-2.0-or-later

pragma solidity ^0.8.0;

contract Proxy {
    address immutable creator;

    constructor() {
        creator = msg.sender;
    }

    // External interface

    fallback() external {
        address creator_ = creator;

        if (msg.sender == creator_) {
            assembly {
                mstore(0, 0)
                calldatacopy(31, 0, calldatasize())

                switch mload(0) // numTopics
                    case 0 { log0(32,  sub(calldatasize(), 1)) }
                    case 1 { log1(64,  sub(calldatasize(), 33),  mload(32)) }
                    case 2 { log2(96,  sub(calldatasize(), 65),  mload(32), mload(64)) }
                    case 3 { log3(128, sub(calldatasize(), 97),  mload(32), mload(64), mload(96)) }
                    case 4 { log4(160, sub(calldatasize(), 129), mload(32), mload(64), mload(96), mload(128)) }
                    default { revert(0, 0) }

                return(0, 0)
            }
        } else {
            assembly {
                mstore(0, 0xe9c4a3ac00000000000000000000000000000000000000000000000000000000) // dispatch() selector
                calldatacopy(4, 0, calldatasize())
                mstore(add(4, calldatasize()), shl(96, caller()))

                let result := call(gas(), creator_, 0, 0, add(24, calldatasize()), 0, 0)
                returndatacopy(0, 0, returndatasize())

                switch result
                    case 0 { revert(0, returndatasize()) }
                    default { return(0, returndatasize()) }
            }
        }
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 1000000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"stateMutability":"nonpayable","type":"fallback"}]

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