static S dumpConcepts(L<AIConcept> concepts) {
  new L<S> l;
  for (AIConcept c : concepts) {
    S s = "  AIConcept(globalID=" + struct(c.globalID)
      + ", name= " + struct(c.name);
    if (nempty(c.comment))
      s += ", comment=" + struct(c.comment);
    l.add(s + ")");
  }
  ret print("[\n" + join(",\n", l) + "\n]");
}