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### Header <boost/unordered_set.hpp>

    namespace boost {
      template<typename Value, typename Hash = boost::hash<Value>,
               typename Pred = std::equal_to<Value>,
               typename Alloc = std::allocator<Value> >
        class unordered_set;
      template<typename Value, typename Hash, typename Pred, typename Alloc>
        bool operator==(unordered_set<Value, Hash, Pred, Alloc> const&,
                        unordered_set<Value, Hash, Pred, Alloc> const&);
      template<typename Value, typename Hash, typename Pred, typename Alloc>
        bool operator!=(unordered_set<Value, Hash, Pred, Alloc> const&,
                        unordered_set<Value, Hash, Pred, Alloc> const&);
      template<typename Value, typename Hash, typename Pred, typename Alloc>
        void swap(unordered_set<Value, Hash, Pred, Alloc>&,
                  unordered_set<Value, Hash, Pred, Alloc>&);
      template<typename Value, typename Hash = boost::hash<Value>,
               typename Pred = std::equal_to<Value>,
               typename Alloc = std::allocator<Value> >
        class unordered_multiset;
      template<typename Value, typename Hash, typename Pred, typename Alloc>
        bool operator==(unordered_multiset<Value, Hash, Pred, Alloc> const&,
                        unordered_multiset<Value, Hash, Pred, Alloc> const&);
      template<typename Value, typename Hash, typename Pred, typename Alloc>
        bool operator!=(unordered_multiset<Value, Hash, Pred, Alloc> const&,
                        unordered_multiset<Value, Hash, Pred, Alloc> const&);
      template<typename Value, typename Hash, typename Pred, typename Alloc>
        void swap(unordered_multiset<Value, Hash, Pred, Alloc>&,
                  unordered_multiset<Value, Hash, Pred, Alloc>&);
    }