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