digraph Syzygy {
  KBNvKB -> KBvKN;
  KBNvKB -> KBNvK;
  KBNvKB -> KBvKB;
  KBvKB -> KBvK;
  KBNvK -> KNvK;
  KBNvK -> KBvK;
  KBvKN -> KNvK;
  KBvKN -> KBvK;
}