using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        string[] words = {"believe", "relief", "receipt", "field"};

        var iAfterE = words.Any(w => w.Contains("ei"));

        Console.WriteLine("There is a word that contains in the list that contains 'ei': {0}", iAfterE);

​

    }

}