static L<S> ai_partsOf(S whole) {
  Set<S> cluster = ai_makeCluster(whole);
  cluster = ai_cluster_forward(cluster, "consists of");
  cluster.addAll(ai_cluster_forward(cluster, "parses to"));
  for (S s : cluster) {
    L<S> l = ai_parseAndList(s);
    if (l(l) >= 2) ret l;
  }
  null;
}