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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract HelloWorld {
    // Function to return the string "Hello, World!"
    function sayHello() public pure returns (string memory) {
        return "Hello, World!";
    }
}

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Great use of SPDX license and pragma solidity version declaration! Simple and clean smart contract for saying hello. Well done!