diff --git a/v0_1_5/lib/marisa_alpha/key.h~ b/v0_1_5/lib/marisa_alpha/key.h~
deleted file mode 100644
index 51d1601..0000000
--- a/v0_1_5/lib/marisa_alpha/key.h~
+++ /dev/null
@@ -1,68 +0,0 @@
-#ifndef MARISA_ALPHA_KEY_H_
-#define MARISA_ALPHA_KEY_H_
-
-#include "string.h"
-
-namespace marisa_alpha {
-
-template <typename T>
-class Key {
- public:
-  Key() : str_(), weight_(0.0), id_(0), terminal_(0) {}
-
-  void set_str(const T &str) {
-    str_ = str;
-  }
-  void set_weight(double weight) {
-    weight_ = weight;
-  }
-  void set_id(UInt32 id) {
-    id_ = id;
-  }
-  void set_terminal(UInt32 terminal) {
-    terminal_ = terminal;
-  }
-
-  const T &str() const {
-    return str_;
-  }
-  double weight() const {
-    return weight_;
-  }
-  UInt32 id() const {
-    return id_;
-  }
-  UInt32 terminal() const {
-    return terminal_;
-  }
-
- private:
-  T str_;
-  double weight_;
-  UInt32 id_;
-  UInt32 terminal_;
-};
-
-template <typename T>
-inline bool operator<(const Key<T> &lhs, const T &rhs) {
-  return lhs.str() < rhs;
-}
-
-template <typename T>
-inline bool operator<(const T &lhs, const Key<T> &rhs) {
-  return lhs < rhs.str();
-}
-
-template <typename T>
-inline bool operator<(const Key<T> &lhs, const Key<T> &rhs) {
-  return lhs.str() < rhs.str();
-}
-
-template <typename T>
-inline bool operator==(const Key<T> &lhs, const Key<T> &rhs) {
-  return lhs.str() == rhs.str();
-}
-
-}  // namespace marisa_alpha
-
-#endif  // MARISA_ALPHA_KEY_H_
diff --git a/v0_1_5/lib/marisa_alpha/reader.h~ b/v0_1_5/lib/marisa_alpha/reader.h~
deleted file mode 100644
index ee7de76..0000000
--- a/v0_1_5/lib/marisa_alpha/reader.h~
+++ /dev/null
@@ -1,60 +0,0 @@
-#ifndef MARISA_ALPHA_READER_H_
-#define MARISA_ALPHA_READER_H_
-
-#include <cstdio>
-#include <iostream>
-
-#include "base.h"
-
-namespace marisa_alpha {
-
-class Reader {
- public:
-  Reader();
-  explicit Reader(std::FILE *file);
-  explicit Reader(int fd);
-  explicit Reader(std::istream *stream);
-  ~Reader();
-
-  void open(const char *filename, long offset = 0, int whence = SEEK_SET);
-
-  template <typename T>
-  void read(T *obj) {
-    MARISA_ALPHA_THROW_IF(obj == NULL, MARISA_ALPHA_PARAM_ERROR);
-    read_data(obj, sizeof(T));
-  }
-
-  template <typename T>
-  void read(T *objs, std::size_t num_objs) {
-    MARISA_ALPHA_THROW_IF((objs == NULL) && (num_objs != 0),
-        MARISA_ALPHA_PARAM_ERROR);
-    MARISA_ALPHA_THROW_IF(num_objs > (MARISA_ALPHA_UINT32_MAX / sizeof(T)),
-        MARISA_ALPHA_SIZE_ERROR);
-    if (num_objs != 0) {
-      read_data(objs, sizeof(T) * num_objs);
-    }
-  }
-
-  bool is_open() const {
-    return (file_ != NULL) || (fd_ != -1) || (stream_ != NULL);
-  }
-
-  void clear();
-  void swap(Reader *rhs);
-
- private:
-  std::FILE *file_;
-  int fd_;
-  std::istream *stream_;
-  bool needs_fclose_;
-
-  void read_data(void *buf, std::size_t size);
-
-  // Disallows copy and assignment.
-  Reader(const Reader &);
-  Reader &operator=(const Reader &);
-};
-
-}  // namespace marisa_alpha
-
-#endif  // MARISA_ALPHA_READER_H_
diff --git a/v0_1_5/lib/marisa_alpha/tail.h~ b/v0_1_5/lib/marisa_alpha/tail.h~
deleted file mode 100644
index c7b3235..0000000
--- a/v0_1_5/lib/marisa_alpha/tail.h~
+++ /dev/null
@@ -1,73 +0,0 @@
-#ifndef MARISA_ALPHA_TAIL_H_
-#define MARISA_ALPHA_TAIL_H_
-
-#include "string.h"
-#include "vector.h"
-
-namespace marisa_alpha {
-
-class Tail {
- public:
-  Tail();
-
-  void build(const Vector<String> &keys,
-      Vector<UInt32> *offsets, int mode);
-
-  void mmap(Mapper *mapper, const char *filename,
-      long offset = 0, int whence = SEEK_SET);
-  void map(const void *ptr, std::size_t size);
-  void map(Mapper &mapper);
-
-  void load(const char *filename,
-      long offset = 0, int whence = SEEK_SET);
-  void fread(::FILE *file);
-  void read(int fd);
-  void read(std::istream &stream);
-  void read(Reader &reader);
-
-  void save(const char *filename, bool trunc_flag = true,
-      long offset = 0, int whence = SEEK_SET) const;
-  void fwrite(::FILE *file) const;
-  void write(int fd) const;
-  void write(std::ostream &stream) const;
-  void write(Writer &writer) const;
-
-  const UInt8 *operator[](std::size_t offset) const {
-    MARISA_ALPHA_DEBUG_IF(offset >= buf_.size(), MARISA_ALPHA_PARAM_ERROR);
-    return &buf_[offset];
-  }
-
-  int mode() const {
-    return (buf_.front() == '\0') ?
-        MARISA_ALPHA_BINARY_TAIL : MARISA_ALPHA_TEXT_TAIL;
-  }
-  bool empty() const {
-    return buf_.empty();
-  }
-  std::size_t size() const {
-    return buf_.size();
-  }
-  std::size_t total_size() const {
-    return buf_.total_size();
-  }
-
-  void clear();
-  void swap(Tail *rhs);
-
- private:
-  Vector<UInt8> buf_;
-
-  void build_binary_tail(const Vector<String> &keys,
-      Vector<UInt32> *offsets);
-  bool build_text_tail(const Vector<String> &keys,
-      Vector<UInt32> *offsets);
-  void build_empty_tail(Vector<UInt32> *offsets);
-
-  // Disallows copy and assignment.
-  Tail(const Tail &);
-  Tail &operator=(const Tail &);
-};
-
-}  // namespace marisa_alpha
-
-#endif  // MARISA_ALPHA_TAIL_H_