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