text: /// mrg ,merge
  std::merge(std::begin(%\m C%), std::end(%\m C%),
  std::begin(%\c), std::end(%\c), std::begin(%\c));
  /// srh ,search
  auto pos = std::search(std::begin(%\m C%), std::end(%\m C%), std::begin(%\c), std::end(%\c));
  if (pos != std::end(%\m C%)) {
      %\c
  }
  /// fni ,find_if
  auto pos = std::find_if(std::begin(%\m C%), std::end(%\m C%), [](%\c) {
    %\c
  });
  if (pos != std::end(%\m C%)) {
    %\c
  }
  