static L<S> endingWithIC_dropSuffix(Collection<S> l, fS suffix) {
  new L<S> out;
  for (S s : unnull(l))
    if (ewic(s, suffix))
      out.add(dropLast(l(suffix), s));
  ret out;
}

static L<S> endingWithIC_dropSuffix(S suffix, Collection<S> l) {
  ret endingWithIC_dropSuffix(l, suffix);
}