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