using System;

using System.Collections.Generic;

using System.Linq;

​

namespace TestNs

{

    public class Program

    {

        public static void Main()

        {

            var dict = new char[4, 4]{{'M', 'I', 'N', 'D'}, {'I', 'I', 'N', 'D'}, {'N', 'E', 'S', 'T'}, {'T', 'E', 'S', 'T'}};

            for (int i = 0; i < dict.GetLength(0); i++)

            {

                for (int j = 0; j < dict.GetLength(1); j++)

                {

                    Console.Write(dict[i, j].ToString());

                }

​

                Console.WriteLine("");

            }

        }

    }

​

    public class WordFinder

    {

        private IEnumerable<string> _matrix;

        public WordFinder(IEnumerable<string> matrix)

        {

            _matrix = matrix;

        }

​

        public IEnumerable<string> Find(IEnumerable<string> wordstream)

        {

            _matrix.Join(wordstream, m => m, w => w, (m, w) => m)

                .GroupBy()

                .Distinct()..ToList().Take(10);

            return Enumerable.Empty<string>();

        }

    }

}