test.sol

pragma solidity ^0.8.18;

contract A{
    uint public a = 3;
    uint public b;
    uint public c;

    function first() public returns(uint) {
        uint z = a;
        assembly{
            sstore(1, z)
        }
        a = a - 1;
        return 0;
    }

    function second() public returns(uint) {
        uint z = a;
        assembly{
            sstore(2, z)
        }
        a = a - 1;
        return 0;
    }

    function inter(uint a, uint b) public {
    }

    function test() public {
        inter(first(), second());
    }

}