using System;

using System.Linq;

using Microsoft.FSharp.Collections;

​

public class Program

{

    private static void PrintStringLists(string label, FSharpList<FSharpList<string>> lists)

    {

        Console.WriteLine(label);

​

        foreach (var list in lists)

        {

            Console.WriteLine($"[{string.Join(',', list.Select(str => $"{str}"))}]");

        }

        Console.WriteLine();

    }

​

    public static void Main()

    {

        var stringArrays =

            new[]

            {

                new [] { "b", "a", "c" },

                new [] { "a", "a" },

                new [] { "a", "b" },

                new [] { "b", "a", "a", "b" },

                new [] { "a" },

                new [] { "b", "a", "d" },

                new [] { "a", "a", "a" },

                new string[] {},

                new [] { "a", "b", "a" },

                new [] { "b", "a", "b" },

                new [] { "b", "a", "a" },

                new [] { "b", "a", "d", "a" },

                new [] { "b", "a", "a", "a" },

                new [] { "b" },

                new [] { "b", "a" },

            };

​

        // both are FSharpList<FSharpList<string>>

        var unsortedStringLists = ListModule.OfSeq(stringArrays.Select(ListModule.OfSeq));

        var sortedStringLists = ListModule.Sort(unsortedStringLists);

​

        PrintStringLists("Unsorted", unsortedStringLists);

        PrintStringLists("Sorted", sortedStringLists);

    }

}

​