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template<typename Rng , typename T , requires  = (Range<Rng>() && Constructible<range_value_t<Rng>, T &&>())>  | 
| auto  | operator() (Rng &&rng, T &&t) const  -> decltype(insert(std::forward< Rng >(rng), std::forward< T >(t)))                                                         | 
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template<typename Rng , typename Rng2 , requires  = (Range<Rng>() && Range<Rng2>())>  | 
| auto  | operator() (Rng &&rng, Rng2 &&rng2) const  -> decltype(insert(std::forward< Rng >(rng), std::forward< Rng2 >(rng2)))                                                         | 
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template<typename Rng , typename T , requires  = (Range<Rng>())>  | 
| auto  | operator() (Rng &&rng, std::initializer_list< T > rng2) const  -> decltype(insert(std::forward< Rng >(rng), rng2))                                                         | 
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template<typename Rng , typename I , typename S , requires  = (Range<Rng>() && Sentinel<S, I>())>  | 
| auto  | operator() (Rng &&rng, I i, S j) const  -> decltype(insert(std::forward< Rng >(rng), i, j))                                                         | 
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template<typename Rng , typename I , typename T , requires  = (Range<Rng>() && Iterator<I>() &&                        Constructible<range_value_t<Rng>, T &&>())>  | 
| auto  | operator() (Rng &&rng, I p, T &&t) const  -> decltype(insert(std::forward< Rng >(rng), p, std::forward< T >(t)))                                                         | 
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template<typename Rng , typename I , typename Rng2 , requires  = (Range<Rng>() && Iterator<I>() && Range<Rng2>())>  | 
| auto  | operator() (Rng &&rng, I p, Rng2 &&rng2) const  -> decltype(insert(std::forward< Rng >(rng), p, std::forward< Rng2 >(rng2)))                                                         | 
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template<typename Rng , typename I , typename T , requires  = (Range<Rng>() && Iterator<I>())>  | 
| auto  | operator() (Rng &&rng, I p, std::initializer_list< T > rng2) const  -> decltype(insert(std::forward< Rng >(rng), p, rng2))                                                         | 
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template<typename Rng , typename I , typename N , typename T , requires  = (Range<Rng>() && Iterator<I>() && Integral<N>()                        && Constructible<range_value_t<Rng>, T &&>())>  | 
| auto  | operator() (Rng &&rng, I p, N n, T &&t) const  -> decltype(insert(std::forward< Rng >(rng), p, n, std::forward< T >(t)))                                                         | 
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template<typename Rng , typename P , typename I , typename S , requires  = (Range<Rng>() && Iterator<P>() && Sentinel<S, I>())>  | 
| auto  | operator() (Rng &&rng, P p, I i, S j) const  -> decltype(insert(std::forward< Rng >(rng), p, i, j))                                                         | 
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