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