A
D
A
D
D
A
D
S
C
D
B
C
B
C
B
A
A
B
B
S
S
A
C
C
D
D
C
A
D
C
B
A
D
A
A
B
A
D
B
S
B
C
C
D
A
S
C
S
S
C
D
D
S
A
B
D
B
B
A
D
D
A
C
S
B
S
C
C
C
S
A
S
A
S
B
S
B
D
B
S
B
S
S
C