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diff --git a/native/dicttoolkit/src/offdevice_intermediate_dict/offdevice_intermediate_dict.h b/native/dicttoolkit/src/offdevice_intermediate_dict/offdevice_intermediate_dict.h
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+/*
+ * Copyright (C) 2014 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_DICT_TOOLKIT_OFFDEVICE_INTERMEDIATE_DICT_H
+#define LATINIME_DICT_TOOLKIT_OFFDEVICE_INTERMEDIATE_DICT_H
+
+#include "dict_toolkit_defines.h"
+#include "offdevice_intermediate_dict/offdevice_intermediate_dict_pt_node_array.h"
+#include "suggest/core/dictionary/property/word_property.h"
+#include "utils/int_array_view.h"
+
+namespace latinime {
+namespace dicttoolkit {
+
+/**
+ * On memory patricia trie to represent a dictionary.
+ */
+class OffdeviceIntermediateDict final {
+ public:
+    bool addWord(const WordProperty &wordProperty);
+    // The returned value will be invalid after modifying the dictionary. e.g. calling addWord().
+    const WordProperty *getWordProperty(const CodePointArrayView codePoints) const;
+
+ private:
+    DISALLOW_ASSIGNMENT_OPERATOR(OffdeviceIntermediateDict);
+
+    OffdeviceIntermediateDictPtNodeArray mRootPtNodeArray;
+
+    bool addWordInner(const CodePointArrayView codePoints, const WordProperty &wordProperty,
+            OffdeviceIntermediateDictPtNodeArray &ptNodeArray);
+};
+
+} // namespace dicttoolkit
+} // namespace latinime
+#endif // LATINIME_DICT_TOOLKIT_OFFDEVICE_INTERMEDIATE_DICT_H