digraph Syzygy {
  KBNvKR -> KBNvK;
  KBNvKR -> KRvKN;
  KBNvKR -> KRvKB;
  KRvKB -> KBvK;
  KRvKB -> KRvK;
  KRvKN -> KNvK;
  KRvKN -> KRvK;
  KBNvK -> KNvK;
  KBNvK -> KBvK;
}