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diff --git a/native/jni/src/dictionary/interface/dictionary_bigrams_structure_policy.h b/native/jni/src/dictionary/interface/dictionary_bigrams_structure_policy.h
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+++ b/native/jni/src/dictionary/interface/dictionary_bigrams_structure_policy.h
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+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * 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 LATINIME_DICTIONARY_BIGRAMS_STRUCTURE_POLICY_H
+#define LATINIME_DICTIONARY_BIGRAMS_STRUCTURE_POLICY_H
+
+#include "defines.h"
+
+namespace latinime {
+
+/*
+ * This class abstracts structure of bigrams.
+ */
+class DictionaryBigramsStructurePolicy {
+ public:
+    virtual ~DictionaryBigramsStructurePolicy() {}
+
+    virtual void getNextBigram(int *const outBigramPos, int *const outProbability,
+            bool *const outHasNext, int *const pos) const = 0;
+    virtual bool skipAllBigrams(int *const pos) const = 0;
+
+ protected:
+    DictionaryBigramsStructurePolicy() {}
+
+ private:
+    DISALLOW_COPY_AND_ASSIGN(DictionaryBigramsStructurePolicy);
+};
+} // namespace latinime
+#endif /* LATINIME_DICTIONARY_BIGRAMS_STRUCTURE_POLICY_H */