static S lines(Iterable lines) { ret fromLines(lines); }
static S lines(O[] lines) { ret fromLines(asList(lines)); }
static L<S> lines(S s) { ret toLines(s); }

// convenience map call
static <A> S lines(Iterable<A> l, IF1<A, B> f) {
  ret mapToLines(l, f);
}