D
C
S
S
D
D
S
V
S
C
S
C
U
S
S
U
D
S
V
C
S
S
D
V
C
U
V
D
U
U
D
D
D
D
C
V
D
C
U
C
V
S
V
D
C
V
S
U
V
S
U
V
U
D
U
V
S
C
V
C
V
S
U
C
V
C
U
U
U
C
V
C
D
U