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