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