// changes set
static Set<S> nlLogic_outputFromExecutedRules(Set<S> set, L<ExecutedRule> l) {
  for (ExecutedRule r : unnull(l))
    addAll(set, r.output);
  ret set;
}

static Set<S> nlLogic_outputFromExecutedRules(L<ExecutedRule> l) {
  ret nlLogic_outputFromExecutedRules(new LinkedHashSet, l);
}