diff --git a/extensions/removerepeatchar.cpp b/extensions/removerepeatchar.cpp
index 6da1f2c..cd8a3e0 100644
--- a/extensions/removerepeatchar.cpp
+++ b/extensions/removerepeatchar.cpp
@@ -5,30 +5,25 @@ bool ProcessSentence(std::wstring& sentence, SentenceInfo sentenceInfo)
 	if (sentenceInfo["text number"] == 0) return false;
 
 	std::vector<int> repeatNumbers(sentence.size() + 1, 0);
-	int repeatNumber = 1;
-	wchar_t prevChar = 0;
-	for (auto nextChar : sentence)
+	for (int i = 0; i < sentence.size(); ++i)
 	{
-		if (nextChar == prevChar)
+		if (sentence[i] != sentence[i + 1])
 		{
-			repeatNumber += 1;
-		}
-		else
-		{
-			prevChar = nextChar;
-			repeatNumbers.at(repeatNumber) += 1;
-			repeatNumber = 1;
+			int j = i;
+			while (sentence[j] == sentence[i] && --j >= 0);
+			repeatNumbers[i - j] += 1;
 		}
 	}
-	if ((repeatNumber = std::distance(repeatNumbers.begin(), std::max_element(repeatNumbers.begin(), repeatNumbers.end()))) == 1) return false;
+	int repeatNumber = std::distance(repeatNumbers.begin(), std::max_element(repeatNumbers.rbegin(), repeatNumbers.rend()).base() - 1);
+	if (repeatNumber < 2) return false;
 
 	std::wstring newSentence;
 	for (int i = 0; i < sentence.size();)
 	{
-		newSentence.push_back(sentence.at(i));
+		newSentence.push_back(sentence[i]);
 		for (int j = i; j <= sentence.size(); ++j)
 		{
-			if (j == sentence.size() || sentence.at(i) != sentence.at(j))
+			if (j == sentence.size() || sentence[i] != sentence[j])
 			{
 				i += (j - i) % repeatNumber == 0 ? repeatNumber : 1;
 				break;
@@ -44,8 +39,11 @@ TEST(
 		InfoForExtension nonConsole[] = { { "text number", 1 }, {} };
 
 		std::wstring repeatedChars = L"aaaaaaaaaaaabbbbbbcccdddaabbbcccddd";
+		std::wstring someRepeatedChars = L"abcdefaabbccddeeff";
 		ProcessSentence(repeatedChars, { nonConsole });
+		ProcessSentence(someRepeatedChars, { nonConsole });
 		assert(repeatedChars.find(L"aaaabbcd") == 0);
+		assert(someRepeatedChars == L"abcdefabcdef");
 
 		std::wstring empty = L"", one = L" ", normal = L"This is a normal sentence. はい";
 		ProcessSentence(empty, { nonConsole });
diff --git a/extensions/removerepeatsentence.cpp b/extensions/removerepeatsentence.cpp
index b07cc4d..a3ab346 100644
--- a/extensions/removerepeatsentence.cpp
+++ b/extensions/removerepeatsentence.cpp
@@ -30,7 +30,7 @@ bool ProcessSentence(std::wstring& sentence, SentenceInfo sentenceInfo)
 	static std::mutex m;
 	m.lock();
 	if (textNumber + 1 > cache.size()) cache.resize(textNumber + 1);
-	auto prevSentences = cache.at(textNumber).Acquire();
+	auto prevSentences = cache[textNumber].Acquire();
 	m.unlock();
 	auto& inserted = prevSentences->emplace_back(sentence);
 	auto firstLocation = std::find(prevSentences->begin(), prevSentences->end(), sentence);