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Some sections of this code came from the Boost examples.
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#include <boost/algorithm/string/predicate.hpp>
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#include <boost/functional/hash.hpp>
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#include <boost/shared_ptr.hpp>
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struct insensitive_equal_to : std::binary_function<std::string, std::string, bool>
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bool operator()(std::string const& x, std::string const& y) const