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diff --git a/src/ceph/src/include/cpp-btree/btree_set.h b/src/ceph/src/include/cpp-btree/btree_set.h
deleted file mode 100644
index f9b2e75..0000000
--- a/src/ceph/src/include/cpp-btree/btree_set.h
+++ /dev/null
@@ -1,121 +0,0 @@
-// Copyright 2013 Google Inc. All Rights Reserved.
-//
-// 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.
-//
-// A btree_set<> implements the STL unique sorted associative container
-// interface (a.k.a set<>) using a btree. A btree_multiset<> implements the STL
-// multiple sorted associative container interface (a.k.a multiset<>) using a
-// btree. See btree.h for details of the btree implementation and caveats.
-
-#ifndef UTIL_BTREE_BTREE_SET_H__
-#define UTIL_BTREE_BTREE_SET_H__
-
-#include <functional>
-#include <memory>
-#include <string>
-
-#include "btree.h"
-#include "btree_container.h"
-
-namespace btree {
-
-// The btree_set class is needed mainly for its constructors.
-template <typename Key,
-          typename Compare = std::less<Key>,
-          typename Alloc = std::allocator<Key>,
-          int TargetNodeSize = 256>
-class btree_set : public btree_unique_container<
-  btree<btree_set_params<Key, Compare, Alloc, TargetNodeSize> > > {
-
-  typedef btree_set<Key, Compare, Alloc, TargetNodeSize> self_type;
-  typedef btree_set_params<Key, Compare, Alloc, TargetNodeSize> params_type;
-  typedef btree<params_type> btree_type;
-  typedef btree_unique_container<btree_type> super_type;
-
- public:
-  typedef typename btree_type::key_compare key_compare;
-  typedef typename btree_type::allocator_type allocator_type;
-
- public:
-  // Default constructor.
-  btree_set(const key_compare &comp = key_compare(),
-            const allocator_type &alloc = allocator_type())
-      : super_type(comp, alloc) {
-  }
-
-  // Copy constructor.
-  btree_set(const self_type &x)
-      : super_type(x) {
-  }
-
-  // Range constructor.
-  template <class InputIterator>
-  btree_set(InputIterator b, InputIterator e,
-            const key_compare &comp = key_compare(),
-            const allocator_type &alloc = allocator_type())
-      : super_type(b, e, comp, alloc) {
-  }
-};
-
-template <typename K, typename C, typename A, int N>
-inline void swap(btree_set<K, C, A, N> &x, btree_set<K, C, A, N> &y) {
-  x.swap(y);
-}
-
-// The btree_multiset class is needed mainly for its constructors.
-template <typename Key,
-          typename Compare = std::less<Key>,
-          typename Alloc = std::allocator<Key>,
-          int TargetNodeSize = 256>
-class btree_multiset : public btree_multi_container<
-  btree<btree_set_params<Key, Compare, Alloc, TargetNodeSize> > > {
-
-  typedef btree_multiset<Key, Compare, Alloc, TargetNodeSize> self_type;
-  typedef btree_set_params<Key, Compare, Alloc, TargetNodeSize> params_type;
-  typedef btree<params_type> btree_type;
-  typedef btree_multi_container<btree_type> super_type;
-
- public:
-  typedef typename btree_type::key_compare key_compare;
-  typedef typename btree_type::allocator_type allocator_type;
-
- public:
-  // Default constructor.
-  btree_multiset(const key_compare &comp = key_compare(),
-                 const allocator_type &alloc = allocator_type())
-      : super_type(comp, alloc) {
-  }
-
-  // Copy constructor.
-  btree_multiset(const self_type &x)
-      : super_type(x) {
-  }
-
-  // Range constructor.
-  template <class InputIterator>
-  btree_multiset(InputIterator b, InputIterator e,
-                 const key_compare &comp = key_compare(),
-                 const allocator_type &alloc = allocator_type())
-      : super_type(b, e, comp, alloc) {
-  }
-};
-
-template <typename K, typename C, typename A, int N>
-inline void swap(btree_multiset<K, C, A, N> &x,
-                 btree_multiset<K, C, A, N> &y) {
-  x.swap(y);
-}
-
-} // namespace btree
-
-#endif  // UTIL_BTREE_BTREE_SET_H__