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diff --git a/gcc-4.9/libstdc++-v3/include/ext/pb_ds/detail/trie_policy/sample_trie_access_traits.hpp b/gcc-4.9/libstdc++-v3/include/ext/pb_ds/detail/trie_policy/sample_trie_access_traits.hpp
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+++ b/gcc-4.9/libstdc++-v3/include/ext/pb_ds/detail/trie_policy/sample_trie_access_traits.hpp
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+// -*- C++ -*-
+
+// Copyright (C) 2005-2014 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the terms
+// of the GNU General Public License as published by the Free Software
+// Foundation; either version 3, or (at your option) any later
+// version.
+
+// This library is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
+
+// Permission to use, copy, modify, sell, and distribute this software
+// is hereby granted without fee, provided that the above copyright
+// notice appears in all copies, and that both that copyright notice
+// and this permission notice appear in supporting documentation. None
+// of the above authors, nor IBM Haifa Research Laboratories, make any
+// representation about the suitability of this software for any
+// purpose. It is provided "as is" without express or implied
+// warranty.
+
+/**
+ * @file trie_policy/sample_trie_access_traits.hpp
+ * Contains a sample probe policy.
+ */
+
+#ifndef PB_DS_SAMPLE_TRIE_E_ACCESS_TRAITS_HPP
+#define PB_DS_SAMPLE_TRIE_E_ACCESS_TRAITS_HPP
+
+namespace __gnu_pbds
+{
+  /// A sample trie element access traits.
+  struct sample_trie_access_traits
+  {
+    typedef std::size_t 		       		size_type;
+    typedef std::string 			       	key_type;
+
+    typedef typename _Alloc::template rebind<key_type>	__rebind_k;
+    typedef typename __rebind_k::other::const_reference	key_const_reference;
+    typedef std::string::const_iterator 		const_iterator;
+
+    /// Element type.
+    typedef char 				       	e_type;
+
+    enum
+      {
+	max_size = 4
+      };
+
+    /// Returns a const_iterator to the first element of r_key.
+    inline static const_iterator
+    begin(key_const_reference);
+
+    /// Returns a const_iterator to the after-last element of r_key.
+    inline static const_iterator
+    end(key_const_reference);
+
+    /// Maps an element to a position.
+    inline static size_type
+    e_pos(e_type);
+  };
+}
+#endif // #ifndef PB_DS_SAMPLE_TRIE_E_ACCESS_TRAITS_HPP