diff --git a/native/jni/src/suggest/core/dictionary/dictionary.cpp b/native/jni/src/suggest/core/dictionary/dictionary.cpp
index fb25f75..4605409 100644
--- a/native/jni/src/suggest/core/dictionary/dictionary.cpp
+++ b/native/jni/src/suggest/core/dictionary/dictionary.cpp
@@ -94,7 +94,7 @@
     if (NOT_A_DICT_POS == pos) {
         return NOT_A_PROBABILITY;
     }
-    return getDictionaryStructurePolicy()->getUnigramProbabilityOfPtNode(pos);
+    return getDictionaryStructurePolicy()->getProbabilityOfPtNode(nullptr /* prevWordsInfo */, pos);
 }
 
 int Dictionary::getMaxProbabilityOfExactMatches(const int *word, int length) const {
@@ -116,8 +116,8 @@
         if (bigramsIt.getBigramPos() == nextWordPos
                 && bigramsIt.getProbability() != NOT_A_PROBABILITY) {
             return mDictionaryStructureWithBufferPolicy->getProbability(
-                    mDictionaryStructureWithBufferPolicy->getUnigramProbabilityOfPtNode(
-                            nextWordPos), bigramsIt.getProbability());
+                    mDictionaryStructureWithBufferPolicy->getProbabilityOfPtNode(
+                            nullptr /* prevWordsInfo */, nextWordPos), bigramsIt.getProbability());
         }
     }
     return NOT_A_PROBABILITY;
diff --git a/native/jni/src/suggest/core/policy/dictionary_structure_with_buffer_policy.h b/native/jni/src/suggest/core/policy/dictionary_structure_with_buffer_policy.h
index a48d644..7ad20e7 100644
--- a/native/jni/src/suggest/core/policy/dictionary_structure_with_buffer_policy.h
+++ b/native/jni/src/suggest/core/policy/dictionary_structure_with_buffer_policy.h
@@ -58,7 +58,8 @@
     virtual int getProbability(const int unigramProbability,
             const int bigramProbability) const = 0;
 
-    virtual int getUnigramProbabilityOfPtNode(const int nodePos) const = 0;
+    virtual int getProbabilityOfPtNode(const PrevWordsInfo *const prevWordsInfo,
+            const int nodePos) const = 0;
 
     virtual int getShortcutPositionOfPtNode(const int nodePos) const = 0;
 
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/backward/v402/ver4_patricia_trie_policy.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/backward/v402/ver4_patricia_trie_policy.cpp
index f478d9b..8819945 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/backward/v402/ver4_patricia_trie_policy.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/backward/v402/ver4_patricia_trie_policy.cpp
@@ -131,7 +131,8 @@
     }
 }
 
-int Ver4PatriciaTriePolicy::getUnigramProbabilityOfPtNode(const int ptNodePos) const {
+int Ver4PatriciaTriePolicy::getProbabilityOfPtNode(const PrevWordsInfo *const prevWordsInfo,
+        const int ptNodePos) const {
     if (ptNodePos == NOT_A_DICT_POS) {
         return NOT_A_PROBABILITY;
     }
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/backward/v402/ver4_patricia_trie_policy.h b/native/jni/src/suggest/policyimpl/dictionary/structure/backward/v402/ver4_patricia_trie_policy.h
index 6d97c7c..c80a73a 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/backward/v402/ver4_patricia_trie_policy.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/backward/v402/ver4_patricia_trie_policy.h
@@ -90,7 +90,8 @@
 
     int getProbability(const int unigramProbability, const int bigramProbability) const;
 
-    int getUnigramProbabilityOfPtNode(const int ptNodePos) const;
+    int getProbabilityOfPtNode(const PrevWordsInfo *const prevWordsInfo,
+            const int ptNodePos) const;
 
     int getShortcutPositionOfPtNode(const int ptNodePos) const;
 
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.cpp
index 531cbb7..53550a4 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.cpp
@@ -295,7 +295,12 @@
     }
 }
 
-int PatriciaTriePolicy::getUnigramProbabilityOfPtNode(const int ptNodePos) const {
+int PatriciaTriePolicy::getProbabilityOfPtNode(const PrevWordsInfo *const prevWordsInfo,
+        const int ptNodePos) const {
+    if (prevWordsInfo) {
+        // TODO: Return probability using prevWordsInfo.
+        return NOT_A_PROBABILITY;
+    }
     if (ptNodePos == NOT_A_DICT_POS) {
         return NOT_A_PROBABILITY;
     }
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.h
index d40b9af..1dd5705 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.h
@@ -63,7 +63,7 @@
 
     int getProbability(const int unigramProbability, const int bigramProbability) const;
 
-    int getUnigramProbabilityOfPtNode(const int ptNodePos) const;
+    int getProbabilityOfPtNode(const PrevWordsInfo *const prevWordsInfo, const int ptNodePos) const;
 
     int getShortcutPositionOfPtNode(const int ptNodePos) const;
 
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.cpp
index 0b5764a..5197a4d 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.cpp
@@ -121,7 +121,12 @@
     }
 }
 
-int Ver4PatriciaTriePolicy::getUnigramProbabilityOfPtNode(const int ptNodePos) const {
+int Ver4PatriciaTriePolicy::getProbabilityOfPtNode(const PrevWordsInfo *const prevWordsInfo,
+        const int ptNodePos) const {
+    if (prevWordsInfo) {
+        // TODO: Return probability using prevWordsInfo.
+        return NOT_A_PROBABILITY;
+    }
     if (ptNodePos == NOT_A_DICT_POS) {
         return NOT_A_PROBABILITY;
     }
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.h
index 85929b7..b0f16cd 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.h
@@ -72,7 +72,7 @@
 
     int getProbability(const int unigramProbability, const int bigramProbability) const;
 
-    int getUnigramProbabilityOfPtNode(const int ptNodePos) const;
+    int getProbabilityOfPtNode(const PrevWordsInfo *const prevWordsInfo, const int ptNodePos) const;
 
     int getShortcutPositionOfPtNode(const int ptNodePos) const;