Dr. P -> Suzy
Suzy -> Dr. P
A -> B
B -> A
B -> D
D -> B
C -> D
D -> C
A -> C
C -> A

Wanda -> Shepler
Shepler -> Wanda
Shepler -> Zora
Zora -> Shepler
Xavier -> Zora
Zora -> Xavier
Wanda -> Xavier
Xavier -> Wanda

Dr. VZ -> Shepler
Shepler -> Dr. VZ