digraph Syzygy {
  KRBvKR -> KRvKB;
  KRBvKR -> KRBvK;
  KRBvKR -> KRvKR;
  KRvKR -> KRvK;
  KRBvK -> KBvK;
  KRBvK -> KRvK;
  KRvKB -> KBvK;
  KRvKB -> KRvK;
}