using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var currencies = new[] { "USD", "EUR", "JPY" };

        Console.WriteLine(currencies.Any(x => x == "MXN"));   // False

        Console.WriteLine(!currencies.Any(x => x == "MXN"));  // True

        Console.WriteLine(currencies.All(x => x != "MXN"));   // True

        Console.WriteLine(currencies.All(x => !x.StartsWith("M")));  // True

    }

}