a
c
x1
c
b
x1
a
x1
b
b
b
x1
b
c
b
x1
a
c
x1
2.2
a
x1
b
b
x1
a
c
x1
b
x1
a
x1
b
x1
a
x1
b
b
b
x1
b
c
b
x1
a
c
x1
true
b
c
b
x1
a
c
x1
a
x1
b
b
b
x1
a
x1
b
x1
a
c
x1
b
x1
a
x1
b
b
x1
true
a
1
1
0
b
1
1
0
c
1
1
7720
a
1
1
0
b
1
1
0
a
x1
b
b
x1
a
x1
b
x1
a
x1
b
b
b
x1
b
c
b
x1
a
c
x1
a
c
x1
c
b
x1
b
c
b
x1
a
c
x1
a
x1
b
b
b
x1
b
c
b
x1
a
c
x1
a
x1
b
x1
a
x1
b
b
x1
a
x1
b
b
b
x1
true
2
1
a
1
1
3
3
b
1
1
1
1
c
1
1
1
1
1
1
1
9084
a
1
1
1
0
0
1
2
2
b
1
1
1
0
0
1
0
0
a
x1
b
b
b
x1
b
c
b
x1
a
c
x1
a
c
x1
c
b
x1
b
c
b
x1
a
c
x1
a
x1
b
b
b
x1
b
c
b
x1
a
c
x1
a
x1
b
b
b
x1
true
Failed!
NaTT
certifiable-1.6