B
A
F
B
B
A
B
A
B
d
c
B
A
f
e
c
B
A
F
B
B
A
B
A
B
d
c
B
A
F
B
B
c
B
A
F
B
B
A
B
A
B
d
c
B
A
f
e
c
B
A
F
B
B
A
B
A
B
d
c
B
A
F
B
B
c
d
B
B
b
a
f
b
a
f
e
c
A
B
c
e
d
B
B
b
a
f
b
a
f
e
c
B
B
d
B
B
b
a
f
b
a
f
e
c
A
B
c
e
d
B
B
b
a
f
b
a
f
e
c
B
B
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