diff --git a/native/jni/src/suggest/core/dicnode/dic_node.h b/native/jni/src/suggest/core/dicnode/dic_node.h
index 3770153..41ef9d2 100644
--- a/native/jni/src/suggest/core/dicnode/dic_node.h
+++ b/native/jni/src/suggest/core/dicnode/dic_node.h
@@ -143,7 +143,7 @@
                 dicNode->mDicNodeState.mDicNodeStatePrevWord.getPrevWordLength(),
                 dicNode->getOutputWordBuf(),
                 dicNode->mDicNodeProperties.getDepth(),
-                dicNode->mDicNodeState.mDicNodeStatePrevWord.mPrevSpacePositions,
+                dicNode->mDicNodeState.mDicNodeStatePrevWord.getSecondWordFirstInputIndex(),
                 mDicNodeState.mDicNodeStateInput.getInputIndex(0) /* lastInputIndex */);
         PROF_NODE_COPY(&dicNode->mProfiler, mProfiler);
     }
@@ -321,8 +321,13 @@
         DUMP_WORD_AND_SCORE("OUTPUT");
     }
 
-    void outputSpacePositionsResult(int *spaceIndices) const {
-        mDicNodeState.mDicNodeStatePrevWord.outputSpacePositions(spaceIndices);
+    int getSecondWordFirstInputIndex(const ProximityInfoState *const pInfoState) const {
+        const int inputIndex = mDicNodeState.mDicNodeStatePrevWord.getSecondWordFirstInputIndex();
+        if (inputIndex == NOT_AN_INDEX) {
+            return NOT_AN_INDEX;
+        } else {
+            return pInfoState->getInputIndexOfSampledPoint(inputIndex);
+        }
     }
 
     bool hasMultipleWords() const {
@@ -573,7 +578,11 @@
         }
     }
 
-    AK_FORCE_INLINE void updateInputIndexG(DicNode_InputStateG *inputStateG) {
+    AK_FORCE_INLINE void updateInputIndexG(const DicNode_InputStateG *const inputStateG) {
+        if (mDicNodeState.mDicNodeStatePrevWord.getPrevWordCount() == 1 && isFirstLetter()) {
+            mDicNodeState.mDicNodeStatePrevWord.setSecondWordFirstInputIndex(
+                    inputStateG->mInputIndex);
+        }
         mDicNodeState.mDicNodeStateInput.updateInputIndexG(inputStateG->mPointerId,
                 inputStateG->mInputIndex, inputStateG->mPrevCodePoint,
                 inputStateG->mTerminalDiffCost, inputStateG->mRawLength);
diff --git a/native/jni/src/suggest/core/dicnode/internal/dic_node_state_prevword.h b/native/jni/src/suggest/core/dicnode/internal/dic_node_state_prevword.h
index b7af970..b898620 100644
--- a/native/jni/src/suggest/core/dicnode/internal/dic_node_state_prevword.h
+++ b/native/jni/src/suggest/core/dicnode/internal/dic_node_state_prevword.h
@@ -22,6 +22,7 @@
 
 #include "defines.h"
 #include "suggest/core/dicnode/dic_node_utils.h"
+#include "suggest/core/layout/proximity_info_state.h"
 
 namespace latinime {
 
@@ -29,9 +30,8 @@
  public:
     AK_FORCE_INLINE DicNodeStatePrevWord()
             : mPrevWordCount(0), mPrevWordLength(0), mPrevWordStart(0), mPrevWordProbability(0),
-              mPrevWordNodePos(NOT_A_DICT_POS) {
+              mPrevWordNodePos(NOT_A_DICT_POS), mSecondWordFirstInputIndex(NOT_AN_INDEX) {
         memset(mPrevWord, 0, sizeof(mPrevWord));
-        memset(mPrevSpacePositions, 0, sizeof(mPrevSpacePositions));
     }
 
     virtual ~DicNodeStatePrevWord() {}
@@ -42,7 +42,7 @@
         mPrevWordStart = 0;
         mPrevWordProbability = -1;
         mPrevWordNodePos = NOT_A_DICT_POS;
-        memset(mPrevSpacePositions, 0, sizeof(mPrevSpacePositions));
+        mSecondWordFirstInputIndex = NOT_AN_INDEX;
     }
 
     void init(const int prevWordNodePos) {
@@ -51,7 +51,7 @@
         mPrevWordStart = 0;
         mPrevWordProbability = -1;
         mPrevWordNodePos = prevWordNodePos;
-        memset(mPrevSpacePositions, 0, sizeof(mPrevSpacePositions));
+        mSecondWordFirstInputIndex = NOT_AN_INDEX;
     }
 
     // Init by copy
@@ -61,14 +61,14 @@
         mPrevWordStart = prevWord->mPrevWordStart;
         mPrevWordProbability = prevWord->mPrevWordProbability;
         mPrevWordNodePos = prevWord->mPrevWordNodePos;
+        mSecondWordFirstInputIndex = prevWord->mSecondWordFirstInputIndex;
         memcpy(mPrevWord, prevWord->mPrevWord, prevWord->mPrevWordLength * sizeof(mPrevWord[0]));
-        memcpy(mPrevSpacePositions, prevWord->mPrevSpacePositions, sizeof(mPrevSpacePositions));
     }
 
     void init(const int16_t prevWordCount, const int16_t prevWordProbability,
             const int prevWordNodePos, const int *const src0, const int16_t length0,
-            const int *const src1, const int16_t length1, const int *const prevSpacePositions,
-            const int lastInputIndex) {
+            const int *const src1, const int16_t length1,
+            const int prevWordSecondWordFirstInputIndex, const int lastInputIndex) {
         mPrevWordCount = min(prevWordCount, static_cast<int16_t>(MAX_RESULTS));
         mPrevWordProbability = prevWordProbability;
         mPrevWordNodePos = prevWordNodePos;
@@ -80,8 +80,7 @@
         mPrevWord[twoWordsLen] = KEYCODE_SPACE;
         mPrevWordStart = length0;
         mPrevWordLength = static_cast<int16_t>(twoWordsLen + 1);
-        memcpy(mPrevSpacePositions, prevSpacePositions, sizeof(mPrevSpacePositions));
-        mPrevSpacePositions[mPrevWordCount - 1] = lastInputIndex;
+        mSecondWordFirstInputIndex = prevWordSecondWordFirstInputIndex;
     }
 
     void truncate(const int offset) {
@@ -96,11 +95,12 @@
         mPrevWordLength = newPrevWordLength;
     }
 
-    void outputSpacePositions(int *spaceIndices) const {
-        // Convert uint16_t to int
-        for (int i = 0; i < MAX_RESULTS; i++) {
-            spaceIndices[i] = mPrevSpacePositions[i];
-        }
+    void setSecondWordFirstInputIndex(const int inputIndex) {
+        mSecondWordFirstInputIndex = inputIndex;
+    }
+
+    int getSecondWordFirstInputIndex() const {
+        return mSecondWordFirstInputIndex;
     }
 
     // TODO: remove
@@ -138,8 +138,6 @@
 
     // TODO: Move to private
     int mPrevWord[MAX_WORD_LENGTH];
-    // TODO: Move to private
-    int mPrevSpacePositions[MAX_RESULTS];
 
  private:
     // Caution!!!
@@ -150,6 +148,7 @@
     int16_t mPrevWordStart;
     int16_t mPrevWordProbability;
     int mPrevWordNodePos;
+    int mSecondWordFirstInputIndex;
 };
 } // namespace latinime
 #endif // LATINIME_DIC_NODE_STATE_PREVWORD_H
diff --git a/native/jni/src/suggest/core/layout/proximity_info_state.h b/native/jni/src/suggest/core/layout/proximity_info_state.h
index 01bf818..c94060f 100644
--- a/native/jni/src/suggest/core/layout/proximity_info_state.h
+++ b/native/jni/src/suggest/core/layout/proximity_info_state.h
@@ -130,6 +130,10 @@
         return mSampledInputYs[index];
     }
 
+    int getInputIndexOfSampledPoint(const int sampledIndex) const {
+        return mSampledInputIndice[sampledIndex];
+    }
+
     bool hasSpaceProximity(const int index) const;
 
     int getLengthCache(const int index) const {
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 e2ef5fc..e0b1c67 100644
--- a/native/jni/src/suggest/core/session/dic_traverse_session.h
+++ b/native/jni/src/suggest/core/session/dic_traverse_session.h
@@ -113,7 +113,9 @@
         if (usedPointerCount != 1) {
             return false;
         }
-        *pointerId = usedPointerId;
+        if (pointerId) {
+            *pointerId = usedPointerId;
+        }
         return true;
     }
 
diff --git a/native/jni/src/suggest/core/suggest.cpp b/native/jni/src/suggest/core/suggest.cpp
index e788e91..0c925be 100644
--- a/native/jni/src/suggest/core/suggest.cpp
+++ b/native/jni/src/suggest/core/suggest.cpp
@@ -117,7 +117,7 @@
  * Outputs the final list of suggestions (i.e., terminal nodes).
  */
 int Suggest::outputSuggestions(DicTraverseSession *traverseSession, int *frequencies,
-        int *outputCodePoints, int *spaceIndices, int *outputTypes) const {
+        int *outputCodePoints, int *outputIndicesToPartialCommit, int *outputTypes) const {
 #if DEBUG_EVALUATE_MOST_PROBABLE_STRING
     const int terminalSize = 0;
 #else
@@ -139,6 +139,7 @@
             SCORING->getMostProbableString(traverseSession, terminalSize, languageWeight,
                     &outputCodePoints[0], &outputTypes[0], &frequencies[0]);
     if (hasMostProbableString) {
+        outputIndicesToPartialCommit[outputWordIndex] = NOT_AN_INDEX;
         ++outputWordIndex;
     }
 
@@ -160,6 +161,9 @@
                             || (traverseSession->getInputSize()
                                     >= MIN_LEN_FOR_MULTI_WORD_AUTOCORRECT
                                             && terminals[0].hasMultipleWords())) : false;
+    // TODO: have partial commit work even with multiple pointers.
+    const bool outputSecondWordFirstLetterInputIndex =
+            traverseSession->isOnlyOnePointerUsed(0 /* pointerId */);
     // Output suggestion results here
     for (int terminalIndex = 0; terminalIndex < terminalSize && outputWordIndex < MAX_RESULTS;
             ++terminalIndex) {
@@ -194,18 +198,21 @@
                 terminalDicNode->isExactMatch()
                         || (forceCommitMultiWords && terminalDicNode->hasMultipleWords())
                                 || (isValidWord && SCORING->doesAutoCorrectValidWord()));
-        maxScore = max(maxScore, finalScore);
-
-        // TODO: Implement a smarter auto-commit method for handling multi-word suggestions.
-        // Index for top typing suggestion should be 0.
-        if (isValidWord && outputWordIndex == 0) {
-            terminalDicNode->outputSpacePositionsResult(spaceIndices);
+        if (maxScore < finalScore && isValidWord) {
+            maxScore = finalScore;
         }
 
         // Don't output invalid words. However, we still need to submit their shortcuts if any.
         if (isValidWord) {
             outputTypes[outputWordIndex] = Dictionary::KIND_CORRECTION | outputTypeFlags;
             frequencies[outputWordIndex] = finalScore;
+            if (outputSecondWordFirstLetterInputIndex) {
+                outputIndicesToPartialCommit[outputWordIndex] =
+                        terminalDicNode->getSecondWordFirstInputIndex(
+                                traverseSession->getProximityInfoState(0));
+            } else {
+                outputIndicesToPartialCommit[outputWordIndex] = NOT_AN_INDEX;
+            }
             // Populate the outputChars array with the suggested word.
             const int startIndex = outputWordIndex * MAX_WORD_LENGTH;
             terminalDicNode->outputResult(&outputCodePoints[startIndex]);
@@ -220,8 +227,19 @@
             // Shortcut is not supported for multiple words suggestions.
             // TODO: Check shortcuts during traversal for multiple words suggestions.
             const bool sameAsTyped = TRAVERSAL->sameAsTyped(traverseSession, terminalDicNode);
-            outputWordIndex = ShortcutUtils::outputShortcuts(&shortcutIt, outputWordIndex,
-                    finalScore, outputCodePoints, frequencies, outputTypes, sameAsTyped);
+            const int updatedOutputWordIndex = ShortcutUtils::outputShortcuts(&shortcutIt,
+                    outputWordIndex,  finalScore, outputCodePoints, frequencies, outputTypes,
+                    sameAsTyped);
+            const int secondWordFirstInputIndex = terminalDicNode->getSecondWordFirstInputIndex(
+                    traverseSession->getProximityInfoState(0));
+            for (int i = outputWordIndex; i < updatedOutputWordIndex; ++i) {
+                if (outputSecondWordFirstLetterInputIndex) {
+                    outputIndicesToPartialCommit[i] = secondWordFirstInputIndex;
+                } else {
+                    outputIndicesToPartialCommit[i] = NOT_AN_INDEX;
+                }
+            }
+            outputWordIndex = updatedOutputWordIndex;
         }
         DicNode::managedDelete(terminalDicNode);
     }
diff --git a/native/jni/src/suggest/core/suggest.h b/native/jni/src/suggest/core/suggest.h
index 875cbe4..b240196 100644
--- a/native/jni/src/suggest/core/suggest.h
+++ b/native/jni/src/suggest/core/suggest.h
@@ -55,7 +55,7 @@
     void createNextWordDicNode(DicTraverseSession *traverseSession, DicNode *dicNode,
             const bool spaceSubstitution) const;
     int outputSuggestions(DicTraverseSession *traverseSession, int *frequencies,
-            int *outputCodePoints, int *outputIndices, int *outputTypes) const;
+            int *outputCodePoints, int *outputIndicesToPartialCommit, int *outputTypes) const;
     void initializeSearch(DicTraverseSession *traverseSession, int commitPoint) const;
     void expandCurrentDicNodes(DicTraverseSession *traverseSession) const;
     void processTerminalDicNode(DicTraverseSession *traverseSession, DicNode *dicNode) const;