// also takes one string with multiple lines
static Web webFromCALStructures(S... structures) {
  if (l(structures) == 1) structures = new S[] {tlft_j(first(structures))};
  ret web_mergeWebs(map webFromCALStructure(structures));
}

static Web webFromCALStructures(L<S> structures) {
  ret web_mergeWebs(map webFromCALStructure(structures));
}