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diff --git a/android/PhoneticStringUtils.h b/android/PhoneticStringUtils.h
deleted file mode 100644
index a567a27..0000000
--- a/android/PhoneticStringUtils.h
+++ /dev/null
@@ -1,59 +0,0 @@
-/*
- * Copyright (C) 2009 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 _ANDROID_PHONETIC_STRING_UTILS_H
-#define _ANDROID_PHONETIC_STRING_UTILS_H
-
-#include <string.h>  // For size_t.
-#include <utils/String8.h>
-
-namespace android {
-
-// Returns codepoint which is "normalized", whose definition depends on each
-// Locale. Note that currently this function normalizes only Japanese; the
-// other characters are remained as is.
-// The variable "next_is_consumed" is set to true if "next_codepoint"
-// is "consumed" (e.g. Japanese halfwidth katakana's voiced mark is consumed
-// when previous "codepoint" is appropriate, like half-width "ka").
-//
-// In Japanese, "normalized" means that half-width and full-width katakana is
-// appropriately converted to hiragana.
-int GetNormalizedCodePoint(char32_t codepoint,
-                           char32_t next_codepoint,
-                           bool *next_is_consumed);
-
-// Pushes Utf8 expression of "codepoint" to "dst". Returns true when successful.
-// If input is invalid or the length of the destination is not enough,
-// returns false.
-bool GetUtf8FromCodePoint(int codepoint, char *dst, size_t len, size_t *index);
-
-// Creates a "phonetically sortable" Utf8 string and push it into "dst".
-// *dst must be freed after being used outside.
-// If "src" is NULL or its length is 0, "dst" is set to \uFFFF.
-//
-// Note that currently this function considers only Japanese.
-bool GetPhoneticallySortableString(const char *src, char **dst, size_t *len);
-
-// Creates a "normalized" Utf8 string and push it into "dst". *dst must be
-// freed after being used outside.
-// If "src" is NULL or its length is 0, "dst" is set to \uFFFF.
-//
-// Note that currently this function considers only Japanese.
-bool GetNormalizedString(const char *src, char **dst, size_t *len);
-
-}  // namespace android
-
-#endif