neighbors_map.py

NEIGHBORS_MAP = {
  0: (4, 6),
  1: (6, 8),
  2: (7, 9),
  3: (4, 8),
  4: (3, 9, 0),
  5: tuple(), # 5 has no neighbors
  6: (1, 7, 0),
  7: (2, 6),
  8: (1, 3),
  9: (2, 4),
}