using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        int[] a = [1,2,3,4];

        var b = a.Where(i => {

            Console.WriteLine("First: " + i);

            return true;

        }).Where(i => {

            Console.WriteLine("Second: " + i);

            return true;

        }).ToList();

    }

}