size_type size() const;
std::pair<iterator,bool> insert( const value_type& value
size_type count( const Key& key ) const; (1)
template <class... Args> iterator emplace_hint( const_iterator
size_type max_size() const;
void pop_back();
reference back();
iterator begin();
allocator_type get_allocator() const;
template< class... Args > void emplace_back( Args&&
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