static L<S> paragraphsFromText(S text) {
  LS lines = toLinesTrim2(text);
  LLS paragraphs = paragraphsFromText_groupParagraphs(lines);
  ret lmap fromLines(paragraphs);
}

static LLS paragraphsFromText_groupParagraphs(L<S> lines) {
  ret groupNonEmpty(lines, func(S line) { empty(line) });
}