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