diff --git a/native/jni/Android.mk b/native/jni/Android.mk
index ea35dab18..34b352433 100644
--- a/native/jni/Android.mk
+++ b/native/jni/Android.mk
@@ -49,9 +49,7 @@ LATIN_IME_CORE_SRC_FILES := \
     bigram_dictionary.cpp \
     char_utils.cpp \
     correction.cpp \
-    dictionary.cpp \
     dic_traverse_wrapper.cpp \
-    digraph_utils.cpp \
     unigram_dictionary.cpp \
     words_priority_queue.cpp \
     suggest/core/suggest.cpp \
@@ -59,6 +57,9 @@ LATIN_IME_CORE_SRC_FILES := \
         dic_node.cpp \
         dic_node_utils.cpp \
         dic_nodes_cache.cpp) \
+    $(addprefix suggest/core/dictionary/, \
+        dictionary.cpp \
+        digraph_utils.cpp) \
     $(addprefix suggest/core/layout/, \
         additional_proximity_chars.cpp \
         proximity_info.cpp \
diff --git a/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp b/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp
index 03b3c6028..9f5e2ae73 100644
--- a/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp
+++ b/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp
@@ -29,13 +29,14 @@
 #include <cstdio> // for fopen() etc.
 #endif // USE_MMAP_FOR_DICTIONARY
 
-#include "binary_format.h"
 #include "com_android_inputmethod_latin_BinaryDictionary.h"
+
 #include "correction.h"
-#include "dictionary.h"
 #include "jni.h"
 #include "jni_common.h"
 #include "suggest_options.h"
+#include "suggest/core/dictionary/binary_format.h"
+#include "suggest/core/dictionary/dictionary.h"
 
 namespace latinime {
 
diff --git a/native/jni/src/bigram_dictionary.cpp b/native/jni/src/bigram_dictionary.cpp
index 9053e7226..c592542bd 100644
--- a/native/jni/src/bigram_dictionary.cpp
+++ b/native/jni/src/bigram_dictionary.cpp
@@ -19,11 +19,12 @@
 #define LOG_TAG "LatinIME: bigram_dictionary.cpp"
 
 #include "bigram_dictionary.h"
-#include "binary_format.h"
-#include "bloom_filter.h"
+
 #include "char_utils.h"
 #include "defines.h"
-#include "dictionary.h"
+#include "suggest/core/dictionary/binary_format.h"
+#include "suggest/core/dictionary/bloom_filter.h"
+#include "suggest/core/dictionary/dictionary.h"
 
 namespace latinime {
 
diff --git a/native/jni/src/suggest/core/dicnode/dic_node.cpp b/native/jni/src/suggest/core/dicnode/dic_node.cpp
index 8c48c587b..de088c7d0 100644
--- a/native/jni/src/suggest/core/dicnode/dic_node.cpp
+++ b/native/jni/src/suggest/core/dicnode/dic_node.cpp
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-#include "dic_node.h"
+#include "suggest/core/dicnode/dic_node.h"
 
 namespace latinime {
 
diff --git a/native/jni/src/suggest/core/dicnode/dic_node.h b/native/jni/src/suggest/core/dicnode/dic_node.h
index 4225bb3e5..1510e3d5e 100644
--- a/native/jni/src/suggest/core/dicnode/dic_node.h
+++ b/native/jni/src/suggest/core/dicnode/dic_node.h
@@ -19,11 +19,11 @@
 
 #include "char_utils.h"
 #include "defines.h"
-#include "dic_node_state.h"
-#include "dic_node_profiler.h"
-#include "dic_node_properties.h"
-#include "dic_node_release_listener.h"
-#include "digraph_utils.h"
+#include "suggest/core/dicnode/dic_node_state.h"
+#include "suggest/core/dicnode/dic_node_profiler.h"
+#include "suggest/core/dicnode/dic_node_properties.h"
+#include "suggest/core/dicnode/dic_node_release_listener.h"
+#include "suggest/core/dictionary/digraph_utils.h"
 
 #if DEBUG_DICT
 #define LOGI_SHOW_ADD_COST_PROP \
diff --git a/native/jni/src/suggest/core/dicnode/dic_node_priority_queue.h b/native/jni/src/suggest/core/dicnode/dic_node_priority_queue.h
index d3f28a8bd..970e3bda4 100644
--- a/native/jni/src/suggest/core/dicnode/dic_node_priority_queue.h
+++ b/native/jni/src/suggest/core/dicnode/dic_node_priority_queue.h
@@ -21,8 +21,8 @@
 #include <vector>
 
 #include "defines.h"
-#include "dic_node.h"
-#include "dic_node_release_listener.h"
+#include "suggest/core/dicnode/dic_node.h"
+#include "suggest/core/dicnode/dic_node_release_listener.h"
 
 #define MAX_DIC_NODE_PRIORITY_QUEUE_CAPACITY 200
 
diff --git a/native/jni/src/suggest/core/dicnode/dic_node_properties.h b/native/jni/src/suggest/core/dicnode/dic_node_properties.h
index 63a6b1340..d2f87c10b 100644
--- a/native/jni/src/suggest/core/dicnode/dic_node_properties.h
+++ b/native/jni/src/suggest/core/dicnode/dic_node_properties.h
@@ -19,8 +19,8 @@
 
 #include <stdint.h>
 
-#include "binary_format.h"
 #include "defines.h"
+#include "suggest/core/dictionary/binary_format.h"
 
 namespace latinime {
 
diff --git a/native/jni/src/suggest/core/dicnode/dic_node_state.h b/native/jni/src/suggest/core/dicnode/dic_node_state.h
index 239b63c32..d35e7d79f 100644
--- a/native/jni/src/suggest/core/dicnode/dic_node_state.h
+++ b/native/jni/src/suggest/core/dicnode/dic_node_state.h
@@ -18,10 +18,10 @@
 #define LATINIME_DIC_NODE_STATE_H
 
 #include "defines.h"
-#include "dic_node_state_input.h"
-#include "dic_node_state_output.h"
-#include "dic_node_state_prevword.h"
-#include "dic_node_state_scoring.h"
+#include "suggest/core/dicnode/dic_node_state_input.h"
+#include "suggest/core/dicnode/dic_node_state_output.h"
+#include "suggest/core/dicnode/dic_node_state_prevword.h"
+#include "suggest/core/dicnode/dic_node_state_scoring.h"
 
 namespace latinime {
 
diff --git a/native/jni/src/suggest/core/dicnode/dic_node_state_prevword.h b/native/jni/src/suggest/core/dicnode/dic_node_state_prevword.h
index e3b892bda..c3968c090 100644
--- a/native/jni/src/suggest/core/dicnode/dic_node_state_prevword.h
+++ b/native/jni/src/suggest/core/dicnode/dic_node_state_prevword.h
@@ -21,7 +21,7 @@
 #include <stdint.h>
 
 #include "defines.h"
-#include "dic_node_utils.h"
+#include "suggest/core/dicnode/dic_node_utils.h"
 
 namespace latinime {
 
diff --git a/native/jni/src/suggest/core/dicnode/dic_node_state_scoring.h b/native/jni/src/suggest/core/dicnode/dic_node_state_scoring.h
index dca9d60da..4c884225a 100644
--- a/native/jni/src/suggest/core/dicnode/dic_node_state_scoring.h
+++ b/native/jni/src/suggest/core/dicnode/dic_node_state_scoring.h
@@ -20,7 +20,7 @@
 #include <stdint.h>
 
 #include "defines.h"
-#include "digraph_utils.h"
+#include "suggest/core/dictionary/digraph_utils.h"
 
 namespace latinime {
 
diff --git a/native/jni/src/suggest/core/dicnode/dic_node_utils.cpp b/native/jni/src/suggest/core/dicnode/dic_node_utils.cpp
index 4fe4badc5..7f0d0ed0e 100644
--- a/native/jni/src/suggest/core/dicnode/dic_node_utils.cpp
+++ b/native/jni/src/suggest/core/dicnode/dic_node_utils.cpp
@@ -17,11 +17,11 @@
 #include <cstring>
 #include <vector>
 
-#include "binary_format.h"
-#include "dic_node.h"
-#include "dic_node_utils.h"
-#include "dic_node_vector.h"
-#include "multi_bigram_map.h"
+#include "suggest/core/dicnode/dic_node.h"
+#include "suggest/core/dicnode/dic_node_utils.h"
+#include "suggest/core/dicnode/dic_node_vector.h"
+#include "suggest/core/dictionary/binary_format.h"
+#include "suggest/core/dictionary/multi_bigram_map.h"
 #include "suggest/core/layout/proximity_info.h"
 #include "suggest/core/layout/proximity_info_state.h"
 
diff --git a/native/jni/src/suggest/core/dicnode/dic_node_vector.h b/native/jni/src/suggest/core/dicnode/dic_node_vector.h
index ca07edaee..e23c411f0 100644
--- a/native/jni/src/suggest/core/dicnode/dic_node_vector.h
+++ b/native/jni/src/suggest/core/dicnode/dic_node_vector.h
@@ -20,7 +20,7 @@
 #include <vector>
 
 #include "defines.h"
-#include "dic_node.h"
+#include "suggest/core/dicnode/dic_node.h"
 
 namespace latinime {
 
diff --git a/native/jni/src/suggest/core/dicnode/dic_nodes_cache.cpp b/native/jni/src/suggest/core/dicnode/dic_nodes_cache.cpp
index b9a60780b..c3d2a2e74 100644
--- a/native/jni/src/suggest/core/dicnode/dic_nodes_cache.cpp
+++ b/native/jni/src/suggest/core/dicnode/dic_nodes_cache.cpp
@@ -17,9 +17,9 @@
 #include <list>
 
 #include "defines.h"
-#include "dic_node_priority_queue.h"
-#include "dic_node_utils.h"
-#include "dic_nodes_cache.h"
+#include "suggest/core/dicnode/dic_node_priority_queue.h"
+#include "suggest/core/dicnode/dic_node_utils.h"
+#include "suggest/core/dicnode/dic_nodes_cache.h"
 
 namespace latinime {
 
diff --git a/native/jni/src/suggest/core/dicnode/dic_nodes_cache.h b/native/jni/src/suggest/core/dicnode/dic_nodes_cache.h
index a62aa422a..7f5bdbcf6 100644
--- a/native/jni/src/suggest/core/dicnode/dic_nodes_cache.h
+++ b/native/jni/src/suggest/core/dicnode/dic_nodes_cache.h
@@ -20,7 +20,7 @@
 #include <stdint.h>
 
 #include "defines.h"
-#include "dic_node_priority_queue.h"
+#include "suggest/core/dicnode/dic_node_priority_queue.h"
 
 #define INITIAL_QUEUE_ID_ACTIVE 0
 #define INITIAL_QUEUE_ID_NEXT_ACTIVE 1
diff --git a/native/jni/src/binary_format.h b/native/jni/src/suggest/core/dictionary/binary_format.h
similarity index 99%
rename from native/jni/src/binary_format.h
rename to native/jni/src/suggest/core/dictionary/binary_format.h
index 98241532f..65c2e9115 100644
--- a/native/jni/src/binary_format.h
+++ b/native/jni/src/suggest/core/dictionary/binary_format.h
@@ -21,9 +21,9 @@
 #include <map>
 #include <stdint.h>
 
-#include "bloom_filter.h"
 #include "char_utils.h"
 #include "hash_map_compat.h"
+#include "suggest/core/dictionary/bloom_filter.h"
 
 namespace latinime {
 
diff --git a/native/jni/src/bloom_filter.h b/native/jni/src/suggest/core/dictionary/bloom_filter.h
similarity index 100%
rename from native/jni/src/bloom_filter.h
rename to native/jni/src/suggest/core/dictionary/bloom_filter.h
diff --git a/native/jni/src/dictionary.cpp b/native/jni/src/suggest/core/dictionary/dictionary.cpp
similarity index 97%
rename from native/jni/src/dictionary.cpp
rename to native/jni/src/suggest/core/dictionary/dictionary.cpp
index d9ed0fe49..1939c7420 100644
--- a/native/jni/src/dictionary.cpp
+++ b/native/jni/src/suggest/core/dictionary/dictionary.cpp
@@ -16,17 +16,17 @@
 
 #define LOG_TAG "LatinIME: dictionary.cpp"
 
-#include "dictionary.h"
+#include "suggest/core/dictionary/dictionary.h"
 
 #include <map> // TODO: remove
 #include <stdint.h>
 
 #include "bigram_dictionary.h"
-#include "binary_format.h"
 #include "defines.h"
 #include "dic_traverse_wrapper.h"
 #include "suggest_options.h"
 #include "suggest/core/suggest.h"
+#include "suggest/core/dictionary/binary_format.h"
 #include "suggest/policyimpl/gesture/gesture_suggest_policy_factory.h"
 #include "suggest/policyimpl/typing/typing_suggest_policy_factory.h"
 #include "unigram_dictionary.h"
diff --git a/native/jni/src/dictionary.h b/native/jni/src/suggest/core/dictionary/dictionary.h
similarity index 100%
rename from native/jni/src/dictionary.h
rename to native/jni/src/suggest/core/dictionary/dictionary.h
diff --git a/native/jni/src/digraph_utils.cpp b/native/jni/src/suggest/core/dictionary/digraph_utils.cpp
similarity index 98%
rename from native/jni/src/digraph_utils.cpp
rename to native/jni/src/suggest/core/dictionary/digraph_utils.cpp
index 083442669..7a0f755e5 100644
--- a/native/jni/src/digraph_utils.cpp
+++ b/native/jni/src/suggest/core/dictionary/digraph_utils.cpp
@@ -14,10 +14,11 @@
  * limitations under the License.
  */
 
+#include "suggest/core/dictionary/digraph_utils.h"
+
 #include "char_utils.h"
-#include "binary_format.h"
 #include "defines.h"
-#include "digraph_utils.h"
+#include "suggest/core/dictionary/binary_format.h"
 
 namespace latinime {
 
diff --git a/native/jni/src/digraph_utils.h b/native/jni/src/suggest/core/dictionary/digraph_utils.h
similarity index 99%
rename from native/jni/src/digraph_utils.h
rename to native/jni/src/suggest/core/dictionary/digraph_utils.h
index 94435228e..c1205940c 100644
--- a/native/jni/src/digraph_utils.h
+++ b/native/jni/src/suggest/core/dictionary/digraph_utils.h
@@ -17,6 +17,8 @@
 #ifndef DIGRAPH_UTILS_H
 #define DIGRAPH_UTILS_H
 
+#include "defines.h"
+
 namespace latinime {
 
 class DigraphUtils {
diff --git a/native/jni/src/multi_bigram_map.h b/native/jni/src/suggest/core/dictionary/multi_bigram_map.h
similarity index 98%
rename from native/jni/src/multi_bigram_map.h
rename to native/jni/src/suggest/core/dictionary/multi_bigram_map.h
index 7e1b6301f..fcac98f35 100644
--- a/native/jni/src/multi_bigram_map.h
+++ b/native/jni/src/suggest/core/dictionary/multi_bigram_map.h
@@ -17,12 +17,11 @@
 #ifndef LATINIME_MULTI_BIGRAM_MAP_H
 #define LATINIME_MULTI_BIGRAM_MAP_H
 
-#include <cstring>
 #include <stdint.h>
 
 #include "defines.h"
-#include "binary_format.h"
 #include "hash_map_compat.h"
+#include "suggest/core/dictionary/binary_format.h"
 
 namespace latinime {
 
diff --git a/native/jni/src/suggest/core/dictionary/shortcut_utils.h b/native/jni/src/suggest/core/dictionary/shortcut_utils.h
index c411408ec..601ac5f5a 100644
--- a/native/jni/src/suggest/core/dictionary/shortcut_utils.h
+++ b/native/jni/src/suggest/core/dictionary/shortcut_utils.h
@@ -19,7 +19,7 @@
 
 #include "defines.h"
 #include "suggest/core/dicnode/dic_node_utils.h"
-#include "terminal_attributes.h"
+#include "suggest/core/dictionary/terminal_attributes.h"
 
 namespace latinime {
 
diff --git a/native/jni/src/terminal_attributes.h b/native/jni/src/suggest/core/dictionary/terminal_attributes.h
similarity index 98%
rename from native/jni/src/terminal_attributes.h
rename to native/jni/src/suggest/core/dictionary/terminal_attributes.h
index 92ef71c2c..8377c603d 100644
--- a/native/jni/src/terminal_attributes.h
+++ b/native/jni/src/suggest/core/dictionary/terminal_attributes.h
@@ -18,7 +18,8 @@
 #define LATINIME_TERMINAL_ATTRIBUTES_H
 
 #include <stdint.h>
-#include "binary_format.h"
+
+#include "suggest/core/dictionary/binary_format.h"
 
 namespace latinime {
 
diff --git a/native/jni/src/suggest/core/layout/touch_position_correction_utils.h b/native/jni/src/suggest/core/layout/touch_position_correction_utils.h
index e7a8cae58..429dcae0d 100644
--- a/native/jni/src/suggest/core/layout/touch_position_correction_utils.h
+++ b/native/jni/src/suggest/core/layout/touch_position_correction_utils.h
@@ -18,7 +18,7 @@
 #define LATINIME_TOUCH_POSITION_CORRECTION_UTILS_H
 
 #include "defines.h"
-#include "proximity_info_params.h"
+#include "suggest/core/layout/proximity_info_params.h"
 
 namespace latinime {
 class TouchPositionCorrectionUtils {
diff --git a/native/jni/src/suggest/core/session/dic_traverse_session.cpp b/native/jni/src/suggest/core/session/dic_traverse_session.cpp
index f9f1c0915..4e634500c 100644
--- a/native/jni/src/suggest/core/session/dic_traverse_session.cpp
+++ b/native/jni/src/suggest/core/session/dic_traverse_session.cpp
@@ -16,12 +16,12 @@
 
 #include "suggest/core/session/dic_traverse_session.h"
 
-#include "binary_format.h"
 #include "defines.h"
-#include "dictionary.h"
 #include "dic_traverse_wrapper.h"
 #include "jni.h"
 #include "suggest/core/dicnode/dic_node_utils.h"
+#include "suggest/core/dictionary/binary_format.h"
+#include "suggest/core/dictionary/dictionary.h"
 
 namespace latinime {
 
diff --git a/native/jni/src/suggest/core/session/dic_traverse_session.h b/native/jni/src/suggest/core/session/dic_traverse_session.h
index c774eae71..e5c7f8e0c 100644
--- a/native/jni/src/suggest/core/session/dic_traverse_session.h
+++ b/native/jni/src/suggest/core/session/dic_traverse_session.h
@@ -22,8 +22,8 @@
 
 #include "defines.h"
 #include "jni.h"
-#include "multi_bigram_map.h"
 #include "suggest/core/dicnode/dic_nodes_cache.h"
+#include "suggest/core/dictionary/multi_bigram_map.h"
 #include "suggest/core/layout/proximity_info_state.h"
 
 namespace latinime {
diff --git a/native/jni/src/suggest/core/suggest.cpp b/native/jni/src/suggest/core/suggest.cpp
index 8fe8fbc95..94441877a 100644
--- a/native/jni/src/suggest/core/suggest.cpp
+++ b/native/jni/src/suggest/core/suggest.cpp
@@ -17,18 +17,18 @@
 #include "suggest/core/suggest.h"
 
 #include "char_utils.h"
-#include "dictionary.h"
-#include "digraph_utils.h"
 #include "suggest/core/dicnode/dic_node.h"
 #include "suggest/core/dicnode/dic_node_priority_queue.h"
 #include "suggest/core/dicnode/dic_node_vector.h"
+#include "suggest/core/dictionary/dictionary.h"
+#include "suggest/core/dictionary/digraph_utils.h"
 #include "suggest/core/dictionary/shortcut_utils.h"
+#include "suggest/core/dictionary/terminal_attributes.h"
 #include "suggest/core/layout/proximity_info.h"
 #include "suggest/core/policy/scoring.h"
 #include "suggest/core/policy/traversal.h"
 #include "suggest/core/policy/weighting.h"
 #include "suggest/core/session/dic_traverse_session.h"
-#include "terminal_attributes.h"
 
 namespace latinime {
 
diff --git a/native/jni/src/unigram_dictionary.cpp b/native/jni/src/unigram_dictionary.cpp
index 08cd7b7fd..1133256c4 100644
--- a/native/jni/src/unigram_dictionary.cpp
+++ b/native/jni/src/unigram_dictionary.cpp
@@ -18,13 +18,13 @@
 
 #define LOG_TAG "LatinIME: unigram_dictionary.cpp"
 
-#include "binary_format.h"
 #include "char_utils.h"
 #include "defines.h"
-#include "dictionary.h"
-#include "digraph_utils.h"
+#include "suggest/core/dictionary/binary_format.h"
+#include "suggest/core/dictionary/dictionary.h"
+#include "suggest/core/dictionary/digraph_utils.h"
+#include "suggest/core/dictionary/terminal_attributes.h"
 #include "suggest/core/layout/proximity_info.h"
-#include "terminal_attributes.h"
 #include "unigram_dictionary.h"
 #include "words_priority_queue.h"
 #include "words_priority_queue_pool.h"
diff --git a/native/jni/src/unigram_dictionary.h b/native/jni/src/unigram_dictionary.h
index a64a539bd..a50503256 100644
--- a/native/jni/src/unigram_dictionary.h
+++ b/native/jni/src/unigram_dictionary.h
@@ -19,8 +19,9 @@
 
 #include <map>
 #include <stdint.h>
+
 #include "defines.h"
-#include "digraph_utils.h"
+#include "suggest/core/dictionary/digraph_utils.h"
 
 namespace latinime {