static ItIt<SS> filterIterator_predicatesOnLine1AndLine2(IPred<S> predOnLine1, IPred<S> predOnLine2, Cl<SS> l) {
  ret filterIterator(l, map -> 
    callPredicate_trueIfNull(predOnLine1, mapGet(map, "line 1")) &&
    callPredicate_trueIfNull(predOnLine2, mapGet(map, "line 2")));
}