std::ranges::bidirectional_range - A range for which ranges::begin returns a bidirectional iterator.

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                                                    libstdc++             std::ranges::bidirectional_range(3cxx)

       template<typename _Tp>
       concept std::ranges::bidirectional_range =  forward_range<_Tp> && bidirectional_iterator<iterator_t<_Tp>>

       A range for which ranges::begin returns a bidirectional iterator.

       std::ranges::bidirectional_range - A range for which ranges::begin returns a bidirectional iterator.

       #include <ranges>