using System;

public class Program

{

    public static void Main()

    {

        var toggle = false;

        Console.WriteLine(toggle ? "yes" : "no");

        toggle |= false;

        Console.WriteLine(toggle ? "yes" : "no");

        toggle |= true;

        Console.WriteLine(toggle ? "yes" : "no");

        toggle |= false;

        Console.WriteLine(toggle ? "yes" : "no");

    }

}