second_it          97 data/sphere/level_set_test.cpp   const auto second_it = std::find(first_it, std::cend(lines), end_vertices);
second_it          98 data/sphere/level_set_test.cpp   if(second_it == first_it)
second_it         104 data/sphere/level_set_test.cpp   for( ; first_it != second_it; ++first_it){