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diff --git a/native/src/proximity_info.h b/native/src/proximity_info.h
deleted file mode 100644
index c1eefeacc..000000000
--- a/native/src/proximity_info.h
+++ /dev/null
@@ -1,134 +0,0 @@
-/*
- * Copyright (C) 2011 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_PROXIMITY_INFO_H
-#define LATINIME_PROXIMITY_INFO_H
-
-#include <stdint.h>
-#include <string>
-
-#include "defines.h"
-
-namespace latinime {
-
-class Correction;
-
-class ProximityInfo {
- public:
-    static const int NORMALIZED_SQUARED_DISTANCE_SCALING_FACTOR_LOG_2 = 10;
-    static const int NORMALIZED_SQUARED_DISTANCE_SCALING_FACTOR =
-            1 << NORMALIZED_SQUARED_DISTANCE_SCALING_FACTOR_LOG_2;
-
-    // Used as a return value for character comparison
-    typedef enum {
-        // Same char, possibly with different case or accent
-        EQUIVALENT_CHAR,
-        // It is a char located nearby on the keyboard
-        NEAR_PROXIMITY_CHAR,
-        // It is an unrelated char
-        UNRELATED_CHAR,
-        // Additional proximity char which can differ by language.
-        ADDITIONAL_PROXIMITY_CHAR
-    } ProximityType;
-
-    ProximityInfo(const std::string localeStr, const int maxProximityCharsSize,
-            const int keyboardWidth, const int keybaordHeight, const int gridWidth,
-            const int gridHeight, const int mostCommonkeyWidth,
-            const int32_t *proximityCharsArray, const int keyCount, const int32_t *keyXCoordinates,
-            const int32_t *keyYCoordinates, const int32_t *keyWidths, const int32_t *keyHeights,
-            const int32_t *keyCharCodes, const float *sweetSpotCenterXs,
-            const float *sweetSpotCenterYs, const float *sweetSpotRadii);
-    ~ProximityInfo();
-    bool hasSpaceProximity(const int x, const int y) const;
-    void setInputParams(const int32_t *inputCodes, const int inputLength,
-            const int *xCoordinates, const int *yCoordinates);
-    const int* getProximityCharsAt(const int index) const;
-    unsigned short getPrimaryCharAt(const int index) const;
-    bool existsCharInProximityAt(const int index, const int c) const;
-    bool existsAdjacentProximityChars(const int index) const;
-    ProximityType getMatchedProximityId(const int index, const unsigned short c,
-            const bool checkProximityChars, int *proximityIndex = 0) const;
-    int getNormalizedSquaredDistance(const int inputIndex, const int proximityIndex) const {
-        return mNormalizedSquaredDistances[inputIndex * MAX_PROXIMITY_CHARS_SIZE + proximityIndex];
-    }
-    bool sameAsTyped(const unsigned short *word, int length) const;
-    const unsigned short* getPrimaryInputWord() const {
-        return mPrimaryInputWord;
-    }
-    bool touchPositionCorrectionEnabled() const {
-        return mTouchPositionCorrectionEnabled;
-    }
-
- private:
-    // The max number of the keys in one keyboard layout
-    static const int MAX_KEY_COUNT_IN_A_KEYBOARD = 64;
-    // The upper limit of the char code in mCodeToKeyIndex
-    static const int MAX_CHAR_CODE = 127;
-    static const float NOT_A_DISTANCE_FLOAT = -1.0f;
-    static const int NOT_A_CODE = -1;
-
-    int getStartIndexFromCoordinates(const int x, const int y) const;
-    void initializeCodeToKeyIndex();
-    float calculateNormalizedSquaredDistance(const int keyIndex, const int inputIndex) const;
-    float calculateSquaredDistanceFromSweetSpotCenter(
-            const int keyIndex, const int inputIndex) const;
-    bool hasInputCoordinates() const;
-    int getKeyIndex(const int c) const;
-    bool hasSweetSpotData(const int keyIndex) const {
-        // When there are no calibration data for a key,
-        // the radius of the key is assigned to zero.
-        return mSweetSpotRadii[keyIndex] > 0.0;
-    }
-    bool isOnKey(const int keyId, const int x, const int y) const;
-    int squaredDistanceToEdge(const int keyId, const int x, const int y) const;
-    void calculateNearbyKeyCodes(
-            const int x, const int y, const int32_t primaryKey, int *inputCodes) const;
-
-    const int MAX_PROXIMITY_CHARS_SIZE;
-    const int KEYBOARD_WIDTH;
-    const int KEYBOARD_HEIGHT;
-    const int GRID_WIDTH;
-    const int GRID_HEIGHT;
-    const int MOST_COMMON_KEY_WIDTH_SQUARE;
-    const int CELL_WIDTH;
-    const int CELL_HEIGHT;
-    const int KEY_COUNT;
-    const bool HAS_TOUCH_POSITION_CORRECTION_DATA;
-    const std::string mLocaleStr;
-    // TODO: remove this
-    const int *mInputCodesFromJava;
-    int32_t *mInputCodes;
-    const int *mInputXCoordinates;
-    const int *mInputYCoordinates;
-    bool mTouchPositionCorrectionEnabled;
-    int32_t *mProximityCharsArray;
-    int *mNormalizedSquaredDistances;
-    int32_t mKeyXCoordinates[MAX_KEY_COUNT_IN_A_KEYBOARD];
-    int32_t mKeyYCoordinates[MAX_KEY_COUNT_IN_A_KEYBOARD];
-    int32_t mKeyWidths[MAX_KEY_COUNT_IN_A_KEYBOARD];
-    int32_t mKeyHeights[MAX_KEY_COUNT_IN_A_KEYBOARD];
-    int32_t mKeyCharCodes[MAX_KEY_COUNT_IN_A_KEYBOARD];
-    float mSweetSpotCenterXs[MAX_KEY_COUNT_IN_A_KEYBOARD];
-    float mSweetSpotCenterYs[MAX_KEY_COUNT_IN_A_KEYBOARD];
-    float mSweetSpotRadii[MAX_KEY_COUNT_IN_A_KEYBOARD];
-    int mInputLength;
-    unsigned short mPrimaryInputWord[MAX_WORD_LENGTH_INTERNAL];
-    int mCodeToKeyIndex[MAX_CHAR_CODE + 1];
-};
-
-} // namespace latinime
-
-#endif // LATINIME_PROXIMITY_INFO_H