namespace boost {
  namespace text {
    namespace v1 {
      template<code_point_iter I1, std::sentinel_for< I1 > S1, 
               code_point_iter I2, std::sentinel_for< I2 > S2> 
        std::ranges::subrange< I1 > find(I1, S1, I2, S2);
      template<code_point_iter I1, code_point_iter I2> 
        std::ranges::subrange< I1 > rfind(I1, I1, I2, I2);
      template<code_point_iter I1, std::sentinel_for< I1 > S1, 
               code_point_iter I2, std::sentinel_for< I2 > S2> 
        I1 find_first_of(I1, S1, I2, S2);
      template<code_point_iter I1, code_point_iter I2> 
        I1 find_last_of(I1, I1, I2, I2);
      template<code_point_iter I1, std::sentinel_for< I1 > S1, 
               code_point_iter I2, std::sentinel_for< I2 > S2> 
        I1 find_first_not_of(I1, S1, I2, S2);
      template<code_point_iter I1, code_point_iter I2> 
        I1 find_last_not_of(I1, I1, I2, I2);
      template<code_point_iter I1, std::sentinel_for< I1 > S1, 
               code_point_iter I2, std::sentinel_for< I2 > S2> 
        bool starts_with(I1, S1, I2, S2);
      template<code_point_iter I1, code_point_iter I2> 
        bool ends_with(I1, I1, I2, I2);
      template<code_point_iter I1, std::sentinel_for< I1 > S1, 
               code_point_iter I2, std::sentinel_for< I2 > S2> 
        bool contains(I1, S1, I2, S2);
      template<utf_range_like R1, utf_range_like R2> 
        unspecified find(R1 &&, R2 &&);
      template<utf_range_like R1, utf_range_like R2> 
        unspecified rfind(R1 &&, R2 &&);
      template<utf_range_like R1, utf_range_like R2> 
        unspecified find_first_of(R1 &&, R2 &&);
      template<utf_range_like R1, utf_range_like R2> 
        unspecified find_last_of(R1 &&, R2 &&);
      template<utf_range_like R1, utf_range_like R2> 
        unspecified find_first_not_of(R1 &&, R2 &&);
      template<utf_range_like R1, utf_range_like R2> 
        unspecified find_last_not_of(R1 &&, R2 &&);
      template<utf_range_like R1, utf_range_like R2> 
        bool starts_with(R1 &&, R2 &&);
      template<utf_range_like R1, utf_range_like R2> 
        bool ends_with(R1 &&, R2 &&);
      template<utf_range_like R1, utf_range_like R2> 
        bool contains(R1 &&, R2 &&);
      template<typename CPIter1, typename Sentinel1, typename CPIter2, 
               typename Sentinel2> 
        auto find(CPIter1 first1, Sentinel1 last1, CPIter2 first2, 
                  Sentinel2 last2);
      template<typename CPIter1, typename CPIter2> 
        auto rfind(CPIter1 first1, CPIter1 last1, CPIter2 first2, 
                   CPIter2 last2);
      template<typename CPIter1, typename Sentinel1, typename CPIter2, 
               typename Sentinel2> 
        auto find_first_of(CPIter1 first1, Sentinel1 last1, CPIter2 first2, 
                           Sentinel2 last2);
      template<typename CPIter1, typename CPIter2> 
        auto find_last_of(CPIter1 first1, CPIter1 last1, CPIter2 first2, 
                          CPIter2 last2);
      template<typename CPIter1, typename Sentinel1, typename CPIter2, 
               typename Sentinel2> 
        auto find_first_not_of(CPIter1 first1, Sentinel1 last1, 
                               CPIter2 first2, Sentinel2 last2);
      template<typename CPIter1, typename CPIter2> 
        auto find_last_not_of(CPIter1 first1, CPIter1 last1, CPIter2 first2, 
                              CPIter2 last2);
      template<typename CPIter1, typename Sentinel1, typename CPIter2, 
               typename Sentinel2> 
        auto starts_with(CPIter1 first1, Sentinel1 last1, CPIter2 first2, 
                         Sentinel2 last2);
      template<typename CPIter1, typename CPIter2> 
        auto ends_with(CPIter1 first1, CPIter1 last1, CPIter2 first2, 
                       CPIter2 last2);
      template<typename CPIter1, typename Sentinel1, typename CPIter2, 
               typename Sentinel2> 
        auto contains(CPIter1 first1, Sentinel1 last1, CPIter2 first2, 
                      Sentinel2 last2);
      template<typename Range1, typename Range2> 
        auto find(Range1 && r1, Range2 && r2);
      template<typename Range1, typename Range2> 
        auto rfind(Range1 && r1, Range2 && r2);
      template<typename Range1, typename Range2> 
        auto find_first_of(Range1 && r1, Range2 && r2);
      template<typename Range1, typename Range2> 
        auto find_last_of(Range1 && r1, Range2 && r2);
      template<typename Range1, typename Range2> 
        auto find_first_not_of(Range1 && r1, Range2 && r2);
      template<typename Range1, typename Range2> 
        auto find_last_not_of(Range1 && r1, Range2 && r2);
      template<typename Range1, typename Range2> 
        auto starts_with(Range1 && r1, Range2 && r2);
      template<typename Range1, typename Range2> 
        auto ends_with(Range1 && r1, Range2 && r2);
      template<typename Range1, typename Range2> 
        auto contains(Range1 && r1, Range2 && r2);
      template<typename GraphemeIter1, typename Sentinel1, 
               typename GraphemeIter2, typename Sentinel2> 
        auto find(GraphemeIter1 first1, Sentinel1 last1, GraphemeIter2 first2, 
                  Sentinel2 last2);
      template<typename GraphemeIter1, typename GraphemeIter2> 
        auto rfind(GraphemeIter1 first1, GraphemeIter1 last1, 
                   GraphemeIter2 first2, GraphemeIter2 last2);
      template<typename GraphemeIter1, typename Sentinel1, 
               typename GraphemeIter2, typename Sentinel2> 
        auto find_first_of(GraphemeIter1 first1, Sentinel1 last1, 
                           GraphemeIter2 first2, Sentinel2 last2);
      template<typename GraphemeIter1, typename GraphemeIter2> 
        auto find_last_of(GraphemeIter1 first1, GraphemeIter1 last1, 
                          GraphemeIter2 first2, GraphemeIter2 last2);
      template<typename GraphemeIter1, typename Sentinel1, 
               typename GraphemeIter2, typename Sentinel2> 
        auto find_first_not_of(GraphemeIter1 first1, Sentinel1 last1, 
                               GraphemeIter2 first2, Sentinel2 last2);
      template<typename GraphemeIter1, typename GraphemeIter2> 
        auto find_last_not_of(GraphemeIter1 first1, GraphemeIter1 last1, 
                              GraphemeIter2 first2, GraphemeIter2 last2);
      template<typename GraphemeIter1, typename Sentinel1, 
               typename GraphemeIter2, typename Sentinel2> 
        auto starts_with(GraphemeIter1 first1, Sentinel1 last1, 
                         GraphemeIter2 first2, Sentinel2 last2);
      template<typename GraphemeIter1, typename GraphemeIter2> 
        auto ends_with(GraphemeIter1 first1, GraphemeIter1 last1, 
                       GraphemeIter2 first2, GraphemeIter2 last2);
      template<typename GraphemeIter1, typename Sentinel1, 
               typename GraphemeIter2, typename Sentinel2> 
        auto contains(GraphemeIter1 first1, Sentinel1 last1, 
                      GraphemeIter2 first2, Sentinel2 last2);
      template<typename GraphemeRange1, typename GraphemeRange2> 
        auto find(GraphemeRange1 && r1, GraphemeRange2 && r2);
      template<typename GraphemeRange, typename Range> 
        auto find(GraphemeRange && r1, Range && r2);
      template<typename Range, typename GraphemeRange> 
        auto find(Range && r1, GraphemeRange && r2);
      template<typename GraphemeRange1, typename GraphemeRange2> 
        auto rfind(GraphemeRange1 && r1, GraphemeRange2 && r2);
      template<typename GraphemeRange, typename Range> 
        auto rfind(GraphemeRange && r1, Range && r2);
      template<typename Range, typename GraphemeRange> 
        auto rfind(Range && r1, GraphemeRange && r2);
      template<typename GraphemeRange1, typename GraphemeRange2> 
        auto find_first_of(GraphemeRange1 && r1, GraphemeRange2 && r2);
      template<typename GraphemeRange, typename Range> 
        auto find_first_of(GraphemeRange && r1, Range && r2);
      template<typename Range, typename GraphemeRange> 
        auto find_first_of(Range && r1, GraphemeRange && r2);
      template<typename GraphemeRange1, typename GraphemeRange2> 
        auto find_last_of(GraphemeRange1 && r1, GraphemeRange2 && r2);
      template<typename GraphemeRange, typename Range> 
        auto find_last_of(GraphemeRange && r1, Range && r2);
      template<typename Range, typename GraphemeRange> 
        auto find_last_of(Range && r1, GraphemeRange && r2);
      template<typename GraphemeRange1, typename GraphemeRange2> 
        auto find_first_not_of(GraphemeRange1 && r1, GraphemeRange2 && r2);
      template<typename GraphemeRange, typename Range> 
        auto find_first_not_of(GraphemeRange && r1, Range && r2);
      template<typename Range, typename GraphemeRange> 
        auto find_first_not_of(Range && r1, GraphemeRange && r2);
      template<typename GraphemeRange1, typename GraphemeRange2> 
        auto find_last_not_of(GraphemeRange1 && r1, GraphemeRange2 && r2);
      template<typename GraphemeRange, typename Range> 
        auto find_last_not_of(GraphemeRange && r1, Range && r2);
      template<typename Range, typename GraphemeRange> 
        auto find_last_not_of(Range && r1, GraphemeRange && r2);
      template<typename GraphemeRange1, typename GraphemeRange2> 
        auto starts_with(GraphemeRange1 && r1, GraphemeRange2 && r2);
      template<typename GraphemeRange, typename Range> 
        auto starts_with(GraphemeRange && r1, Range && r2);
      template<typename Range, typename GraphemeRange> 
        auto starts_with(Range && r1, GraphemeRange && r2);
      template<typename GraphemeRange1, typename GraphemeRange2> 
        auto ends_with(GraphemeRange1 && r1, GraphemeRange2 && r2);
      template<typename GraphemeRange, typename Range> 
        auto ends_with(GraphemeRange && r1, Range && r2);
      template<typename Range, typename GraphemeRange> 
        auto ends_with(Range && r1, GraphemeRange && r2);
      template<typename GraphemeRange1, typename GraphemeRange2> 
        auto contains(GraphemeRange1 && r1, GraphemeRange2 && r2);
      template<typename GraphemeRange, typename Range> 
        auto contains(GraphemeRange && r1, Range && r2);
      template<typename Range, typename GraphemeRange> 
        auto contains(Range && r1, GraphemeRange && r2);
    }
  }
}