diff --git a/rudict/rudict/adjective.cpp b/rudict/rudict/adjective.cpp
index b16fc49..b5709c6 100644
--- a/rudict/rudict/adjective.cpp
+++ b/rudict/rudict/adjective.cpp
@@ -149,12 +149,12 @@ namespace AJ
 	{
 	}
 
-	WordModificatorInterface& AdjectivePair::wordModificator()
+	const WordModificatorInterface& AdjectivePair::wordModificator() const
 	{
 		return modificator;
 	}
 
-	WordHolder& AdjectivePair::word()
+	const WordHolder& AdjectivePair::word() const
 	{
 		return wordRecord;
 	}
diff --git a/rudict/rudict/adjective.h b/rudict/rudict/adjective.h
index 2b8bb72..f586563 100644
--- a/rudict/rudict/adjective.h
+++ b/rudict/rudict/adjective.h
@@ -62,9 +62,9 @@ namespace AJ
 
 		AdjectivePair(AdjectiveStruct iModificator, AdjectiveRecord iWordRecord);
 
-		virtual WordModificatorInterface& wordModificator();
+		virtual const WordModificatorInterface& wordModificator() const;
 
-		virtual WordHolder& word();
+		virtual const WordHolder& word() const;
 
 		virtual std::wstring getType();
 	};
diff --git a/rudict/rudict/grammarCase.h b/rudict/rudict/grammarCase.h
index 380cc85..24a0364 100644
--- a/rudict/rudict/grammarCase.h
+++ b/rudict/rudict/grammarCase.h
@@ -83,6 +83,11 @@ public:
 
 	boost::property_tree::wptree CreateTranslationPropertyTree() const;
 
+	bool operator==(const WordHolder& other) const
+	{
+		return word == other.word;
+	}
+
 };
 
 class WordModificatorInterface
@@ -99,13 +104,18 @@ public:
 	{
 		return modificatorTree;
 	}
+
+	bool operator==(const WordModificatorInterface& other) const
+	{
+		return modificatorTree == other.modificatorTree;
+	}
 };
 
 struct WordPairInterface
 {
-	virtual WordModificatorInterface& wordModificator() = 0;
+	virtual const WordModificatorInterface& wordModificator() const = 0;
 
-	virtual WordHolder& word() = 0;
+	virtual const WordHolder& word() const = 0;
 
 	virtual std::wstring getType() = 0;
 
@@ -113,6 +123,16 @@ struct WordPairInterface
 	{
 
 	}
+
+	bool operator==(const WordPairInterface& other) const
+	{
+		return wordModificator() == other.wordModificator() && word() == other.word();
+	}
+
+	bool operator!=(const WordPairInterface& other) const
+	{
+		return !operator==(other);
+	}
 };
 
 std::wstring NounGenderToWString(NounGender g);
diff --git a/rudict/rudict/http/request_handler.cpp b/rudict/rudict/http/request_handler.cpp
index 3e3f773..5d13ca5 100644
--- a/rudict/rudict/http/request_handler.cpp
+++ b/rudict/rudict/http/request_handler.cpp
@@ -137,6 +137,29 @@ namespace http {
 			return true;
 		}
 
+		void RemoveDuplicates(std::vector<std::shared_ptr<WordPairInterface>>& wordPairSet)
+		{
+			size_t i = 0;
+
+			while (i < wordPairSet.size())
+			{
+				size_t j = i + 1;
+
+				while (j < wordPairSet.size())
+				{
+					if (*wordPairSet[i] == *wordPairSet[j])
+					{
+						wordPairSet.erase(wordPairSet.begin() + j);
+						j--;
+					}
+
+					j++;
+				}
+
+				i++;
+			}
+		}
+
 
 		boost::property_tree::wptree PrepareReport(std::wstring request)
 		{
@@ -158,6 +181,8 @@ namespace http {
 			VB::RecognizeVerb(request, wordPairSet);
 			OT::RecognizeWord(request, wordPairSet);
 			PP::RecognizeWord(request, wordPairSet);
+
+			RemoveDuplicates(wordPairSet);
 			
 			boost::property_tree::wptree wordArr;
 
diff --git a/rudict/rudict/noun.cpp b/rudict/rudict/noun.cpp
index 8ce8225..d51c3ca 100644
--- a/rudict/rudict/noun.cpp
+++ b/rudict/rudict/noun.cpp
@@ -154,12 +154,12 @@ NounPair::NounPair(NounStruct iNounModificator, NounRecord iNoun)
 {
 }
 
-WordModificatorInterface& NounPair::wordModificator()
+const WordModificatorInterface& NounPair::wordModificator() const
 {
 	return nounModificator;
 }
 
-WordHolder& NounPair::word()
+const WordHolder& NounPair::word() const
 {
 	return noun;
 }
diff --git a/rudict/rudict/noun.h b/rudict/rudict/noun.h
index 4af06e2..8cd61d1 100644
--- a/rudict/rudict/noun.h
+++ b/rudict/rudict/noun.h
@@ -151,9 +151,9 @@ namespace NN
 
 		NounPair(NounStruct iNounModificator, NounRecord iNoun);
 
-		virtual WordModificatorInterface& wordModificator();
+		virtual const WordModificatorInterface& wordModificator() const;
 
-		virtual WordHolder& word();
+		virtual const WordHolder& word() const;
 
 		virtual std::wstring getType();
 	};
diff --git a/rudict/rudict/other.cpp b/rudict/rudict/other.cpp
index 2afea06..edbca12 100644
--- a/rudict/rudict/other.cpp
+++ b/rudict/rudict/other.cpp
@@ -64,12 +64,12 @@ namespace OT
 	{
 	}
 
-	WordModificatorInterface& OtherWordPair::wordModificator()
+	const WordModificatorInterface& OtherWordPair::wordModificator() const
 	{
 		return modificator;
 	}
 
-	WordHolder& OtherWordPair::word()
+	const WordHolder& OtherWordPair::word() const
 	{
 		return wordRecord;
 	}
diff --git a/rudict/rudict/other.h b/rudict/rudict/other.h
index 74227c6..9f1f659 100644
--- a/rudict/rudict/other.h
+++ b/rudict/rudict/other.h
@@ -49,9 +49,9 @@ namespace OT
 
 		OtherWordPair(OtherWordModificator iModificator, OtherWordRecord iWordRecord);
 
-		virtual WordModificatorInterface& wordModificator();
+		virtual const WordModificatorInterface& wordModificator() const;
 
-		virtual WordHolder& word();
+		virtual const WordHolder& word() const;
 
 		virtual std::wstring getType();
 	};
diff --git a/rudict/rudict/preposition.cpp b/rudict/rudict/preposition.cpp
index f86c7aa..e9c984e 100644
--- a/rudict/rudict/preposition.cpp
+++ b/rudict/rudict/preposition.cpp
@@ -93,12 +93,12 @@ namespace PP
 	{
 	}
 
-	WordModificatorInterface& PrepositionPair::wordModificator()
+	const WordModificatorInterface& PrepositionPair::wordModificator() const
 	{
 		return modificator;
 	}
 
-	WordHolder& PrepositionPair::word()
+	const WordHolder& PrepositionPair::word() const
 	{
 		return wordRecord;
 	}
@@ -108,11 +108,11 @@ namespace PP
 		return L"preposition";
 	}
 
-
-
 	void RecognizeWord(std::wstring word, std::vector<std::shared_ptr<WordPairInterface>>& wordPair)
 	{
 
+		std::vector<std::shared_ptr<PrepositionPair>> result;
+
 		for (auto& wordRecord : PrepositionRecordArr)
 		{
 			if (wordRecord.GetWord() == word)
diff --git a/rudict/rudict/preposition.h b/rudict/rudict/preposition.h
index 75327ff..55e5170 100644
--- a/rudict/rudict/preposition.h
+++ b/rudict/rudict/preposition.h
@@ -51,9 +51,9 @@ namespace PP
 
 		PrepositionPair(PrepositionModificator iModificator, PrepositionRecord iWordRecord);
 
-		virtual WordModificatorInterface& wordModificator();
+		virtual const WordModificatorInterface& wordModificator() const;
 
-		virtual WordHolder& word();
+		virtual const WordHolder& word() const;
 
 		virtual std::wstring getType();
 	};
diff --git a/rudict/rudict/verb.cpp b/rudict/rudict/verb.cpp
index 1131efb..d16ab2b 100644
--- a/rudict/rudict/verb.cpp
+++ b/rudict/rudict/verb.cpp
@@ -117,12 +117,12 @@ namespace VB
 	{
 	}
 
-	WordModificatorInterface& VerbPair::wordModificator()
+	const WordModificatorInterface& VerbPair::wordModificator()  const
 	{
 		return modificator;
 	}
 
-	WordHolder& VerbPair::word()
+	const WordHolder& VerbPair::word()  const
 	{
 		return wordRecord;
 	}
diff --git a/rudict/rudict/verb.h b/rudict/rudict/verb.h
index 76cf953..9c5fb2f 100644
--- a/rudict/rudict/verb.h
+++ b/rudict/rudict/verb.h
@@ -79,9 +79,9 @@ namespace VB
 
 		VerbPair(VerbStruct iModificator, VerbRecord iWordRecord);
 
-		virtual WordModificatorInterface& wordModificator();
+		virtual  const WordModificatorInterface& wordModificator() const;
 
-		virtual WordHolder& word();
+		virtual  const WordHolder& word() const;
 
 		virtual std::wstring getType();
 	};