OOP 2

using System.Collections.Generic;
namespace TextAnalysis
{
    static class FrequencyAnalysisTask
    {
        public static Dictionary<string, string> GetMostFrequentNextWords(List<List<string>> text)
        {
            var result = new Dictionary<string, string>();
            var test = new Dictionary<string, Dictionary<string, int>>();
            var test2 = new Dictionary<string, Dictionary<string, int>>();
            foreach (var line in text)
            {
                string firstWord = null;
                string secondWord = null;
                string firstTwoWords = null;
                foreach (var thirdWord in line)
                {
                    if (firstWord == null)
                    {
                        firstWord = thirdWord;
                        continue;
                    }
                    else if (secondWord == null)
                    {
                        secondWord = thirdWord;
                        firstTwoWords = firstWord + " " + secondWord;
                        if (!test.ContainsKey(firstWord)) test[firstWord] = new Dictionary<string, int>();
                        if (!test[firstWord].ContainsKey(secondWord)) test[firstWord][secondWord] = 0;
                        test[firstWord][secondWord]++;
                        continue;
                    }
                    firstWord = secondWord;
                    secondWord = thirdWord;
                    if (!test.ContainsKey(firstWord)) test[firstWord] = new Dictionary<string, int>();
                    if (!test[firstWord].ContainsKey(secondWord)) test[firstWord][secondWord] = 0;
                    test[firstWord][secondWord]++;
                    if (!test2.ContainsKey(firstTwoWords)) test2[firstTwoWords] = new Dictionary<string, int>();
                    if (!test2[firstTwoWords].ContainsKey(thirdWord)) test2[firstTwoWords][thirdWord] = 0;
                    test2[firstTwoWords][thirdWord]++;
                    firstTwoWords = firstWord + " " + secondWord;

                }
            }
            foreach (var firstWord in test.Keys)
            {
                int maxWordCount = 0;
                string maxWord = "";
                foreach (var secondWord in test[firstWord].Keys)
                {
                    if (test[firstWord][secondWord] > maxWordCount)
                    {
                        maxWordCount = test[firstWord][secondWord];
                        maxWord = secondWord;
                    }
                    else if (test[firstWord][secondWord] == maxWordCount)
                    {
                        if (string.CompareOrdinal(maxWord, secondWord) > 0) maxWord = secondWord;
                    }
                }
                result[firstWord] = maxWord;
            }
            foreach (var firstTwoWords in test2.Keys)
            {
                int maxWordCount = 0;
                string maxWord = "";
                foreach (var thirdWord in test2[firstTwoWords].Keys)
                {
                    if (test2[firstTwoWords][thirdWord] > maxWordCount)
                    {
                        maxWordCount = test2[firstTwoWords][thirdWord];
                        maxWord = thirdWord;
                    }
                    else if (test2[firstTwoWords][thirdWord] == maxWordCount)
                    {
                        if (string.CompareOrdinal(maxWord, thirdWord) > 0) maxWord = thirdWord;
                    }
                }
                result[firstTwoWords] = maxWord;
            }
            return result;
        }
   }
}