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Insert elements.
template< class InputIt> void insert( InputIt first, InputIt last);
            The elements in the range {first, last)
            whose keys are unique are inserted one at a time, in order. If there
            are elements with duplicate keys; that is, if multiple elements in the
            range have keys that compare equal, only the first equivalent element
            will be inserted.
          
            first and last are not iterators into *this.
          
std::is_constructible_v<value_type, std::iterator_traits<InputIt>::value_type>
            Linear in std::distance(first, last).
          
            Strong guarantee. Calls to memory_resource::allocate
            may throw.
          
| Name | Description | 
|---|---|
| 
                       | An input iterator pointing to the first element to insert, or pointing to the end of the range. | 
| 
                       | An input iterator pointing to the end of the range. | 
| Type | Description | 
|---|---|
| 
                       | a type satisfying the requirements of InputIterator. |