5
4
A B
A C
D C
D B
9
A B
D B
A C
D C
D F
D E
A E
A F
B F
9
D E
A B
D B
A C
D C
D F
A E
A F
B F
3
H C
Q C
Q B
12
A B
D B
A C
D C
D F
D E
A E
A F
B F
F C
K G
D G