using System;
using System.Collections.Generic;

namespace DNA
{
    class Program
    {
        static void Main()
        {
            var dna = "TTTAAAAAGGTTTAAAAAGGAAAACCCCCCAAAAACCCCCAAAAACCCCCCAAAAAGGGTTTAAAAGAAAACCCCCAGGGTTTAGGGTTTAAAAAAGGGTTTA";
            var duplicateSequences = Analyze(dna);
            foreach (var item in duplicateSequences)
            {
                Console.WriteLine(item);
            }
        }

        public static IEnumerable<string> Analyze(string dna)
        {
            var output = new HashSet<string>();
            for (int i = 0; i < dna.Length; i += 10)
            {
                 if (dna.Length < 10)
                 {
                     break;
                 }
                var temp =string.Empty;
                for (int j = 0; j < 10; j++)
                {
                    temp += dna[j];
                }
                if (!output.Contains(temp))
                {
                    output.Add(temp);
                }
            }
            return output;
        }

    }
}