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diff --git a/src/storage/phrase_large_table3.h b/src/storage/phrase_large_table3.h
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+/* 
+ *  libpinyin
+ *  Library to deal with pinyin.
+ *  
+ *  Copyright (C) 2016 Peng Wu <alexepico@gmail.com>
+ *  
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ * 
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *  GNU General Public License for more details.
+ *  
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#ifndef PHRASE_LARGE_TABLE3_H
+#define PHRASE_LARGE_TABLE3_H
+
+#include "novel_types.h"
+#include "memory_chunk.h"
+
+typename Trie;
+
+namespace pinyin{
+
+class PhraseLargeTable3{
+protected:
+    Trie * m_index;
+    MemoryChunk * m_content;
+
+    void reset(){
+        if (m_index) {
+            trie_free(m_index);
+            m_index = NULL;
+        }
+
+        if ( m_chunk ){
+            delete m_chunk;
+            m_chunk = NULL;
+        }
+    }
+public:
+    PhraseLargeTable3(){
+        m_index = NULL;
+        m_chunk = NULL;
+    }
+
+    ~PhraseLargeTable3(){
+        reset();
+    }
+
+    /* load/store method */
+    bool load(Trie * trie, MemoryChunk * chunk);
+
+    bool store(Trie * new_trie, MemoryChunk * new_chunk);
+
+    bool load_text(FILE * file);
+
+    /* search method */
+    int search(int phrase_length, /* in */ const ucs4_t phrase[],
+               /* out */ PhraseTokens tokens) const;
+
+    /* add_index/remove_index method */
+    int add_index(int phrase_length, /* in */ const ucs4_t phrase[], /* in */ phrase_token_t token);
+
+    int remove_index(int phrase_length, /* in */ const ucs4_t phrase[], /* in */ phrase_token_t token);
+
+    /* mask out method */
+    bool mask_out(phrase_token_t mask, phrase_token_t value);
+};
+
+};
+
+#endif