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#include <boost/math/tools/tuple.hpp>
        This header defines the type boost::math::tuple,
        the associated free functions ignore,
        tie, make_tuple,
        get, and associated types
        tuple_size and tuple_element.
      
These types and functions are aliases for:
std::tuple etc when available, otherwise:
          std::tr1::tuple etc when available, otherwise:
          boost::fusion::tuple etc if the compiler supports
            it, otherwise:
          boost::tuple.
          
        So this boost::math::tuple is strongly recommended for maximum
        portability.