using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var range = new[] { 1, 3, 5, 7, 9, 11 };

        var result = range.Select((v, i) => range.Skip(i).Take(2).ToArray()).ToArray();

        foreach(var item in result) {

            Console.WriteLine(String.Join(",", item));

        }

    }

}