f
x
f
yz
f
f
xy
z
f
x
i
x
e
f
x
e
x
f
a
f
a
f
a
f
a
f
a
f
a
f
a
a
e
f
b
b
e
f
a
b
f
b
i
a
f
f
xy
z
f
x
f
yz
f
x
i
x
e
f
x
e
x
f
a
f
a
f
a
f
a
f
a
f
a
f
a
a
e
f
b
b
e
i
e
e
f
e
x
x
f
i
x
x
e
f
x
f
i
x
z
z
f
b
f
b
z
z
i
b
b
i
i
x
x
f
i
x
f
xz
z
i
f
yx
f
i
x
i
y
i
a
f
a
f
a
f
a
f
a
f
a
f
a
a
f
a
f
a
f
a
f
a
f
a
f
a
f
a
f
a
z
z
f
b
a
f
a
f
a
f
a
f
a
f
a
f
a
f
a
b
f
b
f
a
z
f
a
f
a
f
a
f
a
f
a
f
a
f
a
f
b
z
2.1
b02a01e00i13f20
f
f
xy
z
f
x
f
yz
f
f
xy
z
f
x
f
yz
f
f
xy
z
f
x
f
yz
f
x
i
x
e
f
x
i
x
f
x
i
x
e
e
f
x
e
x
f
x
e
f
x
e
x
x
f
a
f
a
f
a
f
a
f
a
f
a
f
a
a
e
f
a
f
a
f
a
f
a
f
a
f
a
f
a
a
f
a
f
a
f
a
f
a
f
a
f
a
f
a
a
e
e
f
b
b
e
f
b
b
f
b
b
e
e
f
x
f
e
z
f
xz
f
x
f
e
z
f
f
xy
z
f
x
f
yz
f
f
x
e
z
1
f
x
e
x
f
xz
f
x
e
f
x
i
e
f
x
e
2
f
x
i
x
e
f
x
f
e
i
e
f
x
f
e
z
f
xz
f
x
i
e
f
x
i
e
x
f
x
i
e
f
x
e
f
x
i
e
f
x
e
f
x
e
x
x
f
x
f
y
i
f
xy
e
f
x
f
y
i
f
xy
f
f
xy
z
f
x
f
yz
f
f
xy
i
f
xy
f
x
i
x
e
e
f
x
f
i
e
i
x
e
f
x
f
i
e
i
x
221
f
x
i
e
x
f
x
f
i
e
i
f
x
i
e
f
x
f
y
i
f
xy
e
e
f
i
e
e
e
f
i
e
e
2
f
x
i
x
e
f
i
e
f
i
e
i
i
e
f
x
f
i
e
i
x
e
e
i
e
e
i
e
f
x
e
x
f
i
e
e
f
i
e
e
e
e
f
x
f
i
x
z
f
e
z
f
x
f
i
x
z
f
f
xy
z
f
x
f
yz
f
f
x
i
x
z
1
f
x
i
x
e
f
e
z
f
x
e
f
e
i
i
x
f
x
e
2
f
x
i
x
e
f
x
f
i
x
i
i
x
f
x
f
i
x
z
f
e
z
f
e
i
i
x
f
e
i
i
x
x
f
e
i
i
x
f
x
e
f
e
i
i
x
f
x
e
f
x
e
x
x
f
x
i
i
y
f
xy
f
x
i
i
y
f
x
f
e
z
f
xz
f
x
f
e
i
i
y
2
f
e
i
i
x
x
f
xy
f
e
x
x
f
e
x
f
x
i
i
y
f
xy
f
e
i
i
x
f
e
i
i
x
x
x
f
i
x
x
e
f
i
x
x
f
x
i
i
y
f
xy
f
i
x
i
i
x
f
x
i
x
e
e
f
x
f
i
x
z
z
f
x
f
i
x
z
f
x
f
i
x
z
f
e
z
f
e
z
f
e
x
x
z
f
b
f
b
z
f
e
z
f
b
f
b
z
f
f
xy
z
f
x
f
yz
f
f
b
b
z
1
f
b
b
e
f
e
z
f
b
f
b
z
z
f
b
f
b
z
f
b
f
b
z
f
e
z
f
e
z
f
e
x
x
z
f
b
e
f
e
i
b
f
b
e
2
f
x
i
x
e
f
b
f
b
i
b
f
b
f
b
z
f
e
z
f
e
i
b
f
e
i
b
b
f
e
i
b
f
b
e
f
e
i
b
f
b
e
f
x
e
x
b
f
x
i
b
f
x
b
f
x
i
b
f
x
f
e
z
f
xz
f
x
f
e
i
b
2
f
e
i
b
b
f
x
b
f
x
f
i
x
b
i
b
f
x
f
i
x
b
2
f
x
i
b
f
x
b
f
x
f
i
x
i
b
f
x
f
i
x
z
z
i
b
i
b
b
i
b
f
x
f
i
x
b
i
b
f
x
f
i
x
b
f
x
f
i
x
z
z
b
f
e
x
i
i
x
f
e
x
f
x
i
i
y
f
xy
f
e
i
i
x
f
e
x
x
i
i
x
i
i
x
x
i
i
x
f
e
x
i
i
x
f
e
x
f
e
x
x
x
f
i
x
f
xz
z
f
i
x
f
xz
21
i
i
x
x
f
i
x
f
i
i
x
z
f
x
f
i
x
z
z
z
f
i
x
e
f
y
i
f
xy
f
i
x
e
2
f
x
f
y
i
f
xy
e
f
i
x
f
x
f
y
i
f
xy
f
i
x
f
xz
z
f
y
i
f
xy
f
y
i
f
xy
i
x
f
y
i
f
xy
f
i
x
e
f
y
i
f
xy
f
i
x
e
f
x
e
x
i
x
i
f
yx
f
i
x
i
y
i
f
yx
f
i
x
f
xz
z
f
i
x
f
x
i
f
yx
2
f
y
i
f
xy
i
x
f
i
x
i
y
f
i
a
e
f
a
f
a
f
a
f
a
f
a
f
a
a
f
i
a
e
2
f
a
f
a
f
a
f
a
f
a
f
a
f
a
a
e
f
i
a
f
a
f
a
f
a
f
a
f
a
f
a
f
a
a
f
i
x
f
xz
z
f
a
f
a
f
a
f
a
f
a
f
a
a
i
a
f
a
f
a
f
a
f
a
f
a
f
a
a
i
a
f
x
e
x
f
i
a
e
f
i
a
e
f
a
f
a
f
a
f
a
f
a
f
a
a
f
a
f
a
f
a
f
a
f
a
f
a
a
f
e
z
f
a
f
f
a
f
a
f
a
f
a
f
a
f
a
a
z
f
e
z
1
f
a
f
a
f
a
f
a
f
a
f
a
f
a
a
e
f
f
a
f
a
f
a
f
a
f
a
f
a
f
a
a
z
f
f
xy
z
f
x
f
yz
f
a
f
f
a
f
a
f
a
f
a
f
a
f
a
a
z
z
f
a
f
f
a
f
a
f
a
f
a
f
a
f
a
a
z
z
f
e
x
x
f
e
z
f
e
z
f
a
f
f
a
f
a
f
a
f
a
f
a
f
a
a
z
f
a
f
f
a
f
a
f
a
f
a
f
a
f
a
a
z
z
f
a
f
a
f
f
a
f
a
f
a
f
a
f
a
a
z
z
z
f
a
f
f
a
f
a
f
a
f
a
f
a
f
a
a
z
f
a
f
f
a
f
a
f
a
f
a
f
a
f
a
a
z
2
f
f
xy
z
f
x
f
yz
f
a
f
a
f
f
a
f
a
f
a
f
a
f
a
a
z
z
f
a
f
a
f
a
f
f
a
f
a
f
a
f
a
a
z
z
z
f
a
f
a
f
f
a
f
a
f
a
f
a
f
a
a
z
f
a
f
a
f
f
a
f
a
f
a
f
a
f
a
a
z
22
f
f
xy
z
f
x
f
yz
f
a
f
a
f
a
f
f
a
f
a
f
a
f
a
a
z
z
f
a
f
a
f
a
f
a
f
f
a
f
a
f
a
a
z
z
z
f
a
f
a
f
a
f
f
a
f
a
f
a
f
a
a
z
f
a
f
a
f
a
f
f
a
f
a
f
a
f
a
a
z
222
f
f
xy
z
f
x
f
yz
f
a
f
a
f
a
f
a
f
f
a
f
a
f
a
a
z
z
f
a
f
a
f
a
f
a
f
a
f
f
a
f
a
a
z
z
z
f
a
f
a
f
a
f
a
f
f
a
f
a
f
a
a
z
f
a
f
a
f
a
f
a
f
f
a
f
a
f
a
a
z
2222
f
f
xy
z
f
x
f
yz
f
a
f
a
f
a
f
a
f
a
f
f
a
f
a
a
z
z
f
a
f
a
f
a
f
a
f
a
f
a
f
f
a
a
z
z
z
f
a
f
a
f
a
f
a
f
a
f
f
a
f
a
a
z
f
a
f
a
f
a
f
a
f
a
f
f
a
f
a
a
z
22222
f
f
xy
z
f
x
f
yz
f
a
f
a
f
a
f
a
f
a
f
a
f
f
a
a
z
f
a
f
a
f
a
f
a
f
a
f
a
f
a
f
a
z
z
f
a
f
a
f
a
f
a
f
a
f
a
f
a
f
a
z
222222
f
f
xy
z
f
x
f
yz
f
a
f
a
f
a
f
a
f
a
f
a
f
f
a
a
z
z
f
a
f
a
f
a
f
a
f
a
f
a
f
f
a
a
z
z
f
b
i
a
f
a
b
f
b
i
a
f
a
b
f
b
i
a
f
a
b
f
b
f
a
b
i
a
f
b
f
a
b
2
f
b
i
a
f
a
b
f
b
f
b
i
a
f
b
f
b
z
z
i
a
f
b
e
f
x
i
f
b
x
f
b
e
2
f
x
f
y
i
f
xy
e
f
b
f
b
f
x
i
f
b
x
f
b
f
b
z
z
f
x
i
f
b
x
f
x
i
f
b
x
b
f
x
i
f
b
x
f
b
e
f
x
i
f
b
x
f
b
e
f
x
e
x
b
f
f
a
b
i
i
a
b
f
f
a
b
i
i
a
21
f
b
f
a
b
i
a
f
f
a
b
i
f
b
f
a
b
f
x
i
f
b
x
b
b
f
a
f
b
i
i
a
b
f
a
f
b
i
i
a
f
f
xy
z
f
x
f
yz
f
f
a
b
i
i
a
f
f
a
b
i
i
a
b
b
f
a
f
b
a
b
f
a
f
b
a
22
i
i
x
x
f
a
f
b
i
i
a
f
a
f
b
i
i
a
b
b
f
b
a
f
i
a
b
f
b
a
f
i
x
f
xz
z
f
i
a
f
a
f
b
a
2
f
a
f
b
a
b
f
i
a
b
f
b
a
f
f
a
f
a
f
a
f
a
f
a
f
a
a
b
f
b
a
f
b
a
f
i
a
b
f
i
a
b
1
i
a
f
a
f
a
f
a
f
a
f
a
f
a
a
f
f
a
f
a
f
a
f
a
f
a
f
a
a
b
f
b
a
f
a
f
f
a
f
a
f
a
f
a
f
a
a
b
f
b
a
f
b
a
f
f
a
f
a
f
a
f
a
f
a
f
a
a
b
f
f
a
f
a
f
a
f
a
f
a
f
a
a
b
f
f
xy
z
f
x
f
yz
f
a
f
f
a
f
a
f
a
f
a
f
a
a
b
f
b
a
f
a
f
a
f
f
a
f
a
f
a
f
a
a
b
f
b
a
f
b
a
f
a
f
f
a
f
a
f
a
f
a
f
a
a
b
f
a
f
f
a
f
a
f
a
f
a
f
a
a
b
2
f
f
xy
z
f
x
f
yz
f
a
f
a
f
f
a
f
a
f
a
f
a
a
b
f
b
a
f
a
f
a
f
a
f
f
a
f
a
f
a
a
b
f
b
a
f
b
a
f
a
f
a
f
f
a
f
a
f
a
f
a
a
b
f
a
f
a
f
f
a
f
a
f
a
f
a
a
b
22
f
f
xy
z
f
x
f
yz
f
a
f
a
f
a
f
f
a
f
a
f
a
a
b
f
b
a
f
a
f
a
f
a
f
a
f
f
a
f
a
a
b
f
b
a
f
b
a
f
a
f
a
f
a
f
f
a
f
a
f
a
a
b
f
a
f
a
f
a
f
f
a
f
a
f
a
a
b
222
f
f
xy
z
f
x
f
yz
f
a
f
a
f
a
f
a
f
f
a
f
a
a
b
f
b
a
f
a
f
a
f
a
f
a
f
a
f
f
a
a
b
f
b
a
f
b
a
f
a
f
a
f
a
f
a
f
f
a
f
a
a
b
f
a
f
a
f
a
f
a
f
f
a
f
a
a
b
2222
f
f
xy
z
f
x
f
yz
f
a
f
a
f
a
f
a
f
a
f
f
a
a
b
f
b
a
f
a
f
a
f
a
f
a
f
a
f
a
f
a
b
f
b
a
f
b
a
f
a
f
a
f
a
f
a
f
a
f
f
a
a
b
f
a
f
a
f
a
f
a
f
a
f
f
a
a
b
22222
f
f
xy
z
f
x
f
yz
f
a
f
a
f
a
f
a
f
a
f
a
f
a
b
f
f
i
a
b
z
f
b
f
a
z
f
f
i
a
b
z
1
f
b
a
f
i
a
b
f
f
b
a
z
f
f
xy
z
f
x
f
yz
f
b
f
a
z
f
b
f
a
z
f
i
a
f
b
z
f
b
f
a
z
f
f
i
a
b
z
f
b
f
a
z
f
f
i
a
b
z
f
f
xy
z
f
x
f
yz
f
i
a
f
b
z
f
b
f
a
z
f
f
a
f
a
f
a
f
a
f
a
f
a
a
f
b
z
f
b
f
a
z
f
b
f
a
z
f
i
a
f
b
z
f
i
a
f
b
z
1
i
a
f
a
f
a
f
a
f
a
f
a
f
a
a
f
f
a
f
a
f
a
f
a
f
a
f
a
a
f
b
z
f
b
f
a
z
f
a
f
f
a
f
a
f
a
f
a
f
a
a
f
b
z
f
b
f
a
z
f
b
f
a
z
f
f
a
f
a
f
a
f
a
f
a
f
a
a
f
b
z
f
f
a
f
a
f
a
f
a
f
a
f
a
a
f
b
z
f
f
xy
z
f
x
f
yz
f
a
f
f
a
f
a
f
a
f
a
f
a
a
f
b
z
f
b
f
a
z
f
a
f
a
f
f
a
f
a
f
a
f
a
a
f
b
z
f
b
f
a
z
f
b
f
a
z
f
a
f
f
a
f
a
f
a
f
a
f
a
a
f
b
z
f
a
f
f
a
f
a
f
a
f
a
f
a
a
f
b
z
2
f
f
xy
z
f
x
f
yz
f
a
f
a
f
f
a
f
a
f
a
f
a
a
f
b
z
f
b
f
a
z
f
a
f
a
f
a
f
f
a
f
a
f
a
a
f
b
z
f
b
f
a
z
f
b
f
a
z
f
a
f
a
f
f
a
f
a
f
a
f
a
a
f
b
z
f
a
f
a
f
f
a
f
a
f
a
f
a
a
f
b
z
22
f
f
xy
z
f
x
f
yz
f
a
f
a
f
a
f
f
a
f
a
f
a
a
f
b
z
f
b
f
a
z
f
a
f
a
f
a
f
a
f
f
a
f
a
a
f
b
z
f
b
f
a
z
f
b
f
a
z
f
a
f
a
f
a
f
f
a
f
a
f
a
a
f
b
z
f
a
f
a
f
a
f
f
a
f
a
f
a
a
f
b
z
222
f
f
xy
z
f
x
f
yz
f
a
f
a
f
a
f
a
f
f
a
f
a
a
f
b
z
f
b
f
a
z
f
a
f
a
f
a
f
a
f
a
f
f
a
a
f
b
z
f
b
f
a
z
f
b
f
a
z
f
a
f
a
f
a
f
a
f
f
a
f
a
a
f
b
z
f
a
f
a
f
a
f
a
f
f
a
f
a
a
f
b
z
2222
f
f
xy
z
f
x
f
yz
f
a
f
a
f
a
f
a
f
a
f
f
a
a
f
b
z
f
b
f
a
z
f
a
f
a
f
a
f
a
f
a
f
a
f
a
f
b
z
f
b
f
a
z
f
b
f
a
z
f
a
f
a
f
a
f
a
f
a
f
f
a
a
f
b
z
f
a
f
a
f
a
f
a
f
a
f
f
a
a
f
b
z
22222
f
f
xy
z
f
x
f
yz
f
a
f
a
f
a
f
a
f
a
f
a
f
a
f
b
z
kbcv2.0.0.0