using System;

using MoreLinq;

using System.Linq;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        var a = new int?[] { 0, 1, null };

        var b = new int?[] { 0, 1, 2 };

        var c = a.FullGroupJoin(b, p => p, p => p).ToArray();

        c.ForEach(p => Console.WriteLine(JsonConvert.SerializeObject(p.Item1) + " " + JsonConvert.SerializeObject(p.Item2) + " " + JsonConvert.SerializeObject(p.Item3)));

    }

}