using System.Collections.Generic;
public static void Main()
List<string> order1 = new List<string>() { "pepperoni", "mushroom" };
List<string> order2 = new List<string>() { "onion", "pepperoni", "mushroom" };
bool isEqual = order1.TrueForAll(x => order2.Contains(x));
Console.WriteLine("Are the orders equal? " + isEqual);