svoid nuLike onConceptChangeByClasses_notOnAllChanged(Concepts cc default db_mainConcepts(), Cl<Class> types, Runnable r) {
  cc.addConceptIndex(new IConceptIndex {
    public void update(Concept c) { if (isInstanceOfAny(c, types)) pcallF(r); }
    public void remove(Concept c) { if (isInstanceOfAny(c, types)) pcallF(r); }
  });
}