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diff --git a/tesseract/src/dict/stopper.h b/tesseract/src/dict/stopper.h
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+/******************************************************************************
+ ** Filename:    stopper.h
+ ** Purpose:     Stopping criteria for word classifier.
+ ** Author:      Dan Johnson
+ ** History:     Wed May  1 09:42:57 1991, DSJ, Created.
+ **
+ ** (c) Copyright Hewlett-Packard Company, 1988.
+ ** Licensed under the Apache License, Version 2.0 (the "License");
+ ** you may not use this file except in compliance with the License.
+ ** You may obtain a copy of the License at
+ ** http://www.apache.org/licenses/LICENSE-2.0
+ ** Unless required by applicable law or agreed to in writing, software
+ ** distributed under the License is distributed on an "AS IS" BASIS,
+ ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ ** See the License for the specific language governing permissions and
+ ** limitations under the License.
+ ******************************************************************************/
+#ifndef   STOPPER_H
+#define   STOPPER_H
+
+#include "params.h"
+#include "ratngs.h"
+
+#include "genericvector.h"
+#include <tesseract/unichar.h>
+
+namespace tesseract {
+
+class WERD_CHOICE;
+
+using BLOB_WIDTH = uint8_t;
+
+struct DANGERR_INFO {
+  DANGERR_INFO() :
+    begin(-1), end(-1), dangerous(false), correct_is_ngram(false),
+    leftmost(INVALID_UNICHAR_ID) {}
+  DANGERR_INFO(int b, int e, bool d, bool n, UNICHAR_ID l) :
+    begin(b), end(e), dangerous(d), correct_is_ngram(n), leftmost(l) {}
+  int begin;
+  int end;
+  bool dangerous;
+  bool correct_is_ngram;
+  UNICHAR_ID leftmost;   // in the replacement, what's the leftmost character?
+};
+
+using DANGERR = GenericVector<DANGERR_INFO>;
+
+} // namespace tesseract
+
+#endif