static LS ai_mechListsWithPossibleRules() {
  new LS names;
  for (S name : mechListNames()) {
    LS tok = javaTok(mL_raw(name));
    if (jcontains(tok, "=>") && jcontainsOneOf(tok, "i(", "input(", "o(", "output(", "fact("))
      names.add(name);
  }
  ret names;
}