using System; 

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("enter a colour combination");

        string colourcombination = Console.ReadLine();

        switch (colourcombination) {

        case "red":

        case "amber":

        Console.WriteLine("stop");

        break;

        case "flashing amber":

        case "green":

        Console.WriteLine("go");

        break;

        default:

        Console.WriteLine("please enter a colour combination");

        break;

}

​

    }

}

​

​