B
F
V
F
3
B
3
3
3
V
B
F
S
F
3
F
3
B
V
V
3
F
B
B
B
V
V
3
B
V
S
F
B
B
S
B
V
3
B
S
S
3
V
B
F
S
F
3
F
3
3
3
V
S
F
S
S
F
F
3
S
B
B
S
V
V
S
F
V
V
S
F
S
3
B
B
F
3
3
V
F
V
F
B
V
S
S
S
V
S