a
b
a
x1
b
c
x1
b
b
b
x1
c
b
x1
c
x1
a
b
x1
c
d
x1
d
c
b
a
x1
2.2
c
x1
a
b
x1
c
d
x1
c
b
a
x1
c
d
x1
b
a
x1
a
b
a
x1
c
x1
c
x1
b
x1
b
b
b
x1
c
b
x1
c
d
x1
a
x1
a
b
a
x1
b
c
x1
true
a
b
a
x1
b
c
x1
c
d
x1
a
x1
b
b
b
x1
c
b
x1
c
x1
b
x1
c
d
x1
c
b
a
x1
a
b
a
x1
c
x1
c
d
x1
b
a
x1
c
x1
a
b
x1
true
a
1
1
0
d
1
1
1
b
1
1
0
c
1
1
0
c
1
1
0
a
1
1
0
b
1
1
0
c
x1
a
b
x1
a
b
a
x1
c
x1
c
x1
b
x1
b
b
b
x1
c
b
x1
a
b
a
x1
b
c
x1
c
d
x1
d
c
b
a
x1
a
b
a
x1
b
c
x1
c
x1
a
b
x1
b
b
b
x1
c
b
x1
a
b
a
x1
c
x1
a
b
a
x1
b
c
x1
c
x1
b
x1
c
x1
a
b
x1
b
b
b
x1
c
b
x1
true
a
1
1
8366
d
1
44083
b
1
1
8366
c
1
1
16732
c
1
1
8366
a
1
1
0
b
1
1
0
b
b
b
x1
c
b
x1
c
x1
a
b
x1
a
b
a
x1
b
c
x1
c
d
x1
d
c
b
a
x1
a
b
a
x1
b
c
x1
c
x1
a
b
x1
b
b
b
x1
c
b
x1
a
b
a
x1
b
c
x1
c
x1
a
b
x1
b
b
b
x1
c
b
x1
true
Failed!
NaTT
certifiable-1.6