// opt parameter int max
static Set<ES> applyAttractors_es(L<? extends IAttractor> attractors, Collection<ES> inputs, O... _) {
  Set<ES> out = cloneLinkedCISet_es(inputs);
  for unnull (ES input : inputs)
    functionReturningList_transitiveHull_ciSet_es(func(ES s) -> Collection<ES> { applyAttractors_es_step(attractors, s) }, input, paramsPlus(_, seen := out));
  ret out;
}