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diff --git a/boost/preprocessor/seq/cat.hpp b/boost/preprocessor/seq/cat.hpp
new file mode 100644
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+++ b/boost/preprocessor/seq/cat.hpp
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+# /* **************************************************************************
+#  *                                                                          *
+#  *     (C) Copyright Paul Mensonides 2002.
+#  *     Distributed under the Boost Software License, Version 1.0. (See
+#  *     accompanying file LICENSE_1_0.txt or copy at
+#  *     http://www.boost.org/LICENSE_1_0.txt)
+#  *                                                                          *
+#  ************************************************************************** */
+#
+# /* See http://www.boost.org for most recent version. */
+#
+# ifndef BOOST_PREPROCESSOR_SEQ_CAT_HPP
+# define BOOST_PREPROCESSOR_SEQ_CAT_HPP
+#
+# include <boost/preprocessor/arithmetic/dec.hpp>
+# include <boost/preprocessor/config/config.hpp>
+# include <boost/preprocessor/control/if.hpp>
+# include <boost/preprocessor/seq/fold_left.hpp>
+# include <boost/preprocessor/seq/seq.hpp>
+# include <boost/preprocessor/seq/size.hpp>
+# include <boost/preprocessor/tuple/eat.hpp>
+#
+# /* BOOST_PP_SEQ_CAT */
+#
+# define BOOST_PP_SEQ_CAT(seq) \
+    BOOST_PP_IF( \
+        BOOST_PP_DEC(BOOST_PP_SEQ_SIZE(seq)), \
+        BOOST_PP_SEQ_CAT_I, \
+        BOOST_PP_SEQ_HEAD \
+    )(seq) \
+    /**/
+# define BOOST_PP_SEQ_CAT_I(seq) BOOST_PP_SEQ_FOLD_LEFT(BOOST_PP_SEQ_CAT_O, BOOST_PP_SEQ_HEAD(seq), BOOST_PP_SEQ_TAIL(seq))
+#
+# define BOOST_PP_SEQ_CAT_O(s, st, elem) BOOST_PP_SEQ_CAT_O_I(st, elem)
+# define BOOST_PP_SEQ_CAT_O_I(a, b) a ## b
+#
+# /* BOOST_PP_SEQ_CAT_S */
+#
+# define BOOST_PP_SEQ_CAT_S(s, seq) \
+    BOOST_PP_IF( \
+        BOOST_PP_DEC(BOOST_PP_SEQ_SIZE(seq)), \
+        BOOST_PP_SEQ_CAT_S_I_A, \
+        BOOST_PP_SEQ_CAT_S_I_B \
+    )(s, seq) \
+    /**/
+# define BOOST_PP_SEQ_CAT_S_I_A(s, seq) BOOST_PP_SEQ_FOLD_LEFT_ ## s(BOOST_PP_SEQ_CAT_O, BOOST_PP_SEQ_HEAD(seq), BOOST_PP_SEQ_TAIL(seq))
+# define BOOST_PP_SEQ_CAT_S_I_B(s, seq) BOOST_PP_SEQ_HEAD(seq)
+#
+# endif