static Map orderedFieldToFieldIndex(fS fieldA, fS fieldB, Iterable l) {
  ret pairsToOrderedMap((L) collectTwoFieldsAsPair(fieldA, fieldB, l));
}

static Map orderedFieldToFieldIndex(Iterable l, S fieldA, S fieldB) {
  ret orderedFieldToFieldIndex(fieldA, fieldB, l);
}