f
f
x1
b
b
b
x1
a
f
x1
f
a
a
x1
b
b
x1
c
c
a
c
x1
d
b
x1
d
a
b
x1
c
c
x1
d
d
d
x1
b
d
x1
d
b
x1
c
d
d
x1
f
x1
2.2
a
f
x1
a
a
x1
c
d
d
x1
f
x1
b
b
x1
c
x1
c
c
x1
d
x1
b
b
x1
c
a
c
x1
b
b
x1
a
c
x1
f
f
x1
b
b
b
x1
c
c
x1
d
d
d
x1
b
b
x1
c
c
a
c
x1
b
d
x1
b
x1
d
b
x1
d
a
b
x1
f
f
x1
b
x1
a
f
x1
a
x1
a
f
x1
f
a
a
x1
c
c
x1
d
d
x1
f
f
x1
b
b
x1
b
d
x1
d
b
x1
d
b
x1
a
b
x1
true
d
b
x1
a
b
x1
b
d
x1
d
b
x1
f
f
x1
b
b
b
x1
f
f
x1
b
b
x1
b
b
x1
a
c
x1
c
c
x1
d
d
x1
a
f
x1
f
a
a
x1
a
f
x1
a
x1
f
f
x1
b
x1
b
b
x1
c
a
c
x1
c
c
x1
d
x1
b
b
x1
c
x1
d
b
x1
d
a
b
x1
c
d
d
x1
f
x1
b
d
x1
b
x1
b
b
x1
c
c
a
c
x1
c
c
x1
d
d
d
x1
a
f
x1
a
a
x1
true
a
1
1
0
d
1
1
12000
b
1
1
27000
c
1
1
18000
f
1
1
42000
d
1
1
1
f
1
1
27004
c
1
1
6002
a
1
1
0
b
1
1
15003
d
b
x1
d
a
b
x1
d
b
x1
d
a
b
x1
f
f
x1
b
b
b
x1
b
b
x1
c
c
a
c
x1
c
c
x1
d
d
d
x1
c
d
d
x1
f
x1
b
d
x1
d
b
x1
a
f
x1
f
a
a
x1
d
b
x1
d
a
b
x1
true
a
1
1
a
1
0
d
1
0
b
1
1
c
1
0
1
f
1
0
d
1
0
1
f
1
0
c
1
0
b
1
0
a
1
1
0
d
1
1
193733
b
1
1
452043
c
1
1
290600
f
1
1
678065
d
1
1
1
f
1
1
c
1
1
b
1
1
d
b
x1
d
a
b
x1
f
f
x1
b
b
b
x1
b
b
x1
c
c
a
c
x1
c
c
x1
d
d
d
x1
c
d
d
x1
f
x1
b
d
x1
d
b
x1
a
f
x1
f
a
a
x1
NaTT
certifiable-1.6