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diff --git a/main.cpp b/main.cpp
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+++ b/main.cpp
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+
+// ClauDiff
+#include <iostream>
+#include <utility>
+#include <vector>
+
+#include <map>
+
+#include "clau_parser.h"
+
+
+class _Out {
+private:
+	std::string LOG_FILE_NAME = "clautext_log.txt";
+	std::ofstream outFile;
+			
+	long policy = 0; // default 0 - only console, 1 - only file, 2 - file and console. else - none
+public:
+	_Out& operator = (const _Out& other) {
+		policy = other.policy;
+		return *this;
+	}
+
+	template<class T>
+	_Out& operator << (const T& data)
+	{
+		if (0 == policy || 2 == policy) {
+			std::cout << data;
+		}
+		if (1 == policy || 2 == policy) {
+			//std::ofstream outFile;
+			//outFile.open(LOG_FILE_NAME, std::ios::app);
+			outFile << data;
+			//outFile.close();
+		}
+
+		return *this;
+	}
+
+	void clear_file()
+	{
+		if (1 == policy || 2 == policy) {
+			std::ofstream outFile;
+			outFile.open(LOG_FILE_NAME);
+			outFile.close();
+		}
+	}
+public:
+	_Out(std::string log_file_name = "log.txt", long policy = 0)
+		: LOG_FILE_NAME(log_file_name), policy(policy) {
+		
+	}
+	~_Out() {
+		if (outFile.is_open()) {
+			outFile.close();
+		}
+	}
+
+	void SetFileName(const std::string& fileName) {
+		LOG_FILE_NAME = fileName;
+	}
+	void Open() {
+		if (1 == policy || 2 == policy) {
+			outFile.open(LOG_FILE_NAME);
+		}
+	}
+	void SetPolicy(long policy) {
+		this->policy = policy;
+	}
+};
+_Out Out;
+
+
+
+std::vector<std::pair<int, std::pair<int/* > 0, < 0 */, std::string>>> diff(clau_parser::UserType* before, clau_parser::UserType* after,
+			bool onlyChange = false) {
+	std::vector<std::pair<int, std::pair<int/* > 0 , < 0 */, std::string>>> result;
+
+	std::queue<std::pair<int, std::pair<int, std::string>>> plus_result;
+	std::queue<std::pair<int, std::pair<int, std::string>>> minus_result;
+
+	std::map<std::string, size_t> before_map; // map -> set
+	std::map<std::string, size_t> after_map;
+
+	clau_parser::ClauParserTraverser iter_before(before);
+	clau_parser::ClauParserTraverser iter_after(after);
+
+	clau_parser::ClauParserTraverser x = iter_before;
+	clau_parser::ClauParserTraverser y = iter_after;
+	
+	clau_parser::ClauParserTraverser _x = x;
+	clau_parser::ClauParserTraverser _y = y;
+
+
+	clau_parser::ClauParserTraverser __x = _x;
+	clau_parser::ClauParserTraverser __y = _y;
+
+	std::string temp;
+	std::string str1;
+	std::string str2;
+
+	int line = 0;
+
+	while (!x.is_end() && !y.is_end()) {
+				
+		line++;
+
+		str1.clear();
+		str2.clear();
+
+		before_map.clear();
+		after_map.clear();
+
+		{
+			_x = x;
+			_y = y;
+
+			if (_x.get_type() == _y.get_type() && _x.get_string() == _y.get_string()) {
+
+
+				// not_use?
+
+				result.push_back({ line, { 0, _x.get_string() } });
+
+				x.next();
+				y.next();
+			}
+			else {
+				__x = _x;
+				__y = _y;
+
+				size_t count__x = 0;
+				size_t count__y = 0;
+
+				// find same value position.
+				if (__x.get_type() == clau_parser::ValueType::key || __x.get_type() == clau_parser::ValueType::value) {
+					before_map.insert({ __x.get_string(), count__x });
+				}
+				if (__y.get_type() == clau_parser::ValueType::key || __y.get_type() == clau_parser::ValueType::value) {
+					after_map.insert({ __y.get_string(), count__y });
+				}
+
+				{
+					std::string same_value;
+					int turn = 1; // 1 -> -1 -> 1 -> -1 ...
+					bool pass = false;
+
+					while (!__x.is_end() && !__y.is_end()) {
+						if (turn == 1) {
+							__x.next();
+							count__x++;
+
+							if (__x.get_type() == clau_parser::ValueType::key || __x.get_type() == clau_parser::ValueType::value) {
+							}
+							else {
+								turn *= -1;
+								continue;
+							}
+
+							before_map.insert({ __x.get_string(), count__x });
+
+							// if found same value?
+							if (after_map.end() != after_map.find(__x.get_string())) {
+								pass = true;
+								same_value = __x.get_string();
+								count__y = after_map.find(__x.get_string())->second;
+								break;
+							}
+						}
+						else {
+							__y.next();
+							count__y++;
+
+							if (__x.get_type() == clau_parser::ValueType::key || __x.get_type() == clau_parser::ValueType::value) {
+							}
+							else {
+								turn *= -1;
+								continue;
+							}
+
+							after_map.insert({ __y.get_string(), count__y });
+
+							// if found same value?
+							if (before_map.end() != before_map.find(__y.get_string())) {
+								pass = true;
+								same_value = __y.get_string();
+								count__x = after_map.find(__y.get_string())->second;
+								break;
+							}
+						}
+
+						turn *= -1; // change turn.
+					}
+
+
+					// found same value,
+					if (pass) {
+						std::string temp;
+						
+						int _line = line;
+
+						while ((temp = x.get_string()) != same_value) {
+							
+							if (!plus_result.empty()) {
+								if (temp != plus_result.front().second.second) {
+									minus_result.push({ _line, { -1, temp } });
+								}
+								else {
+									plus_result.pop();
+								}
+							}
+							else {
+								minus_result.push(std::make_pair((_line), std::make_pair(-1, temp)));
+							}
+
+							x.next();
+						}
+
+						_line = line;
+
+						while ((temp = y.get_string()) != same_value) {
+							
+							if (!minus_result.empty()) {
+								if (temp != minus_result.front().second.second) {
+									plus_result.push({ _line, { 1, temp } });
+								}
+								else {
+									minus_result.pop();
+								}
+							}
+							else {
+								plus_result.push(std::make_pair((_line), std::make_pair(+1, temp)));
+							}
+
+							y.next();
+						}
+					}
+				}
+			}
+		}
+	}
+
+	// delete -
+	if (!x.is_end()) {
+		std::string temp;
+
+		while (!x.is_end()) {
+			temp += x.get_string() + " ";
+
+			x.next();
+		}
+
+		++line;
+
+		if (!plus_result.empty()) {
+			if (temp != plus_result.front().second.second) {
+				minus_result.push({ line, { -1, temp } });
+			}
+			else {
+				plus_result.pop();
+			}
+		}
+		else {
+			minus_result.push({ line, { -1, temp } });
+		}
+	}
+	// added +
+	if (!y.is_end()) {
+		std::string temp;
+
+		while (!y.is_end()) {
+			temp += y.get_string() + " ";
+
+			y.next();
+		}
+
+		++line;
+
+		if (!minus_result.empty()) {
+			if (temp != minus_result.front().second.second) {
+				plus_result.push({ line, { 1, temp } });
+			}
+			else {
+				minus_result.pop();
+			}
+		}
+		else {
+			plus_result.push({ line, { 1, temp } });
+		}
+	}
+
+	while (!minus_result.empty()) {
+		result.push_back(minus_result.front());
+		minus_result.pop();
+	}
+
+	while (!plus_result.empty()) {
+		result.push_back(plus_result.front());
+		plus_result.pop();
+	}
+
+
+
+	return result;
+}
+
+class Comp {
+public:
+	bool operator()(const std::pair<int /*line */, std::pair<int/* +1, -1 */, std::string>>& x, const std::pair<int/* line */, std::pair<int/* +1, -1 */, std::string>>& y) const {
+		if (x.first == y.first) {
+			return x.second.first < y.second.first;
+		}
+		return x.first < y.first;
+	}
+};
+
+int main(int argc, char* argv[])
+{
+	if (argc != 3) {
+		return 1;
+	}
+
+	std::string before_file = argv[1];
+	std::string after_file = argv[2];
+
+	clau_parser::UserType beforeUT;
+	clau_parser::UserType afterUT;
+
+	// error check.. -todo.
+	clau_parser::LoadData::LoadDataFromFile(before_file, beforeUT, 0, 0); // 1 vs 0 - scan.. different algorithms?
+	clau_parser::LoadData::LoadDataFromFile(after_file, afterUT, 0, 0);
+
+	Out.SetPolicy(1);
+	Out.SetFileName("output.md");
+	Out.clear_file();
+	Out.Open();
+
+
+	Out << "```diff" << "\n";
+
+	std::vector<std::pair<int, std::pair<int/* +1, -1 */, std::string>>> result = diff(&beforeUT, &afterUT);
+
+
+	std::stable_sort(result.begin(), result.end(), Comp());
+
+	int count = 0;
+	int state = 0;
+	for (size_t i = 0; i < result.size(); ++i) {
+
+		if (i > 0 && result[i - 1].second.first > 0 && result[i].second.first > 0) {
+			state = 1;
+		}
+		else if (i > 0 && result[i - 1].second.first < 0 && result[i].second.first < 0) {
+			state = 1;
+		}
+		else if (i > 0) {
+
+			count++;
+			if (count >= 5) {
+				Out << "\n";
+				count = 0;
+			}
+
+			state = 0;
+		}
+		
+		//Out << result[i].first << " ";
+		if (result[i].second.first > 0) {
+			if (state == 0) {
+				Out << "\n+####" << result[i].second.second << " ";
+			}
+			else {
+				Out << result[i].second.second << " ";
+			}
+		}
+		else if (result[i].second.first < 0) {
+			if (state == 0) {
+				Out << "\n-####" << result[i].second.second << " ";
+			}
+			else {
+				Out << result[i].second.second << " ";
+			}
+		}
+		else {
+			Out << result[i].second.second << " ";
+		}
+	}
+	Out << "\n";
+
+	Out << "```" << "\n";
+
+	return 0;
+}
+
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