[wolf seal orca lion fox deer bear]

wolf: ROOT
seal: CHILD OF wolf
orca: CHILD OF seal
(wolf: seal ==> NULL), (seal: NULL ==> wolf)
lion: CHILD OF orca
fox: CHILD OF lion
(seal: orca ==> lion), (orca: lion ==> NULL), (lion: NULL ==> orca)
deer: CHILD OF fox
bear: CHILD OF deer
(lion: fox ==> deer), (fox: deer ==> NULL), (deer: NULL ==> fox)

Depth First Traversal:
  3: bear(RED) c=[NULL, NULL], p=[deer]
  3: fox(RED) c=[NULL, NULL], p=[deer]
  2: deer(BLACK) c=[bear, fox], p=[lion]
  2: orca(BLACK) c=[NULL, NULL], p=[lion]
  1: lion(RED) c=[deer, orca], p=[seal]
  1: wolf(BLACK) c=[NULL, NULL], p=[seal]
  0: seal(BLACK) c=[lion, wolf], p=[NULL]