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Simple Contract Source Code in Runes Chain

//SPDX-License-Identifier: UNLCIENSED
pragma solidity ^0.8.19;
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";

/**
 * @dev THIS CONTRACT IS FOR TESTING PURPOSES ONLY.
 */
contract Runes is ERC20 {
    uint8 internal decimals_;

    constructor() ERC20("RUNES", "RUNES") {
        decimals_ = 8;
    }

    function mint(uint256 _amount) public {
        _mint(msg.sender, _amount);
    }

    function mintTo(uint256 _amount, address _to) public {
        _mint(_to, _amount);
    }

    function decimals() public view virtual override returns (uint8) {
        return decimals_;
    }
}

How to create simple contract on Runes Chain?