Inheritance.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;


// GGGF -> Great Grand Grand Father
// GGF -> Great Grand Father
// GF -> Grand Father
// F -> Father

contract GGGF {

    function name () public pure virtual returns ( string memory) {
        return 'GGGF';
    }
}

contract GGF is GGGF{

    function name () public pure virtual override returns ( string memory) {
        return 'GGF';
    }

    function a () public pure returns ( string memory) {
        return 'a';
    }
}

contract GF is GGGF, GGF{

    function name () public pure virtual override(GGGF, GGF) returns ( string memory) {
        return 'GF';
    }

    function b () public pure returns ( string memory) {
        return 'b';
    }
}

contract F is GGGF, GGF, GF{

    function name () public pure override(GGGF, GGF, GF) returns ( string memory) {
        return 'F';
    }
}