c
c
c
a
x1
d
d
x1
d
b
x1
c
c
x1
b
c
x1
b
a
c
x1
c
x1
a
a
x1
d
x1
b
c
x1
2.2
d
b
x1
c
x1
c
c
c
a
x1
d
d
x1
c
c
c
a
x1
d
x1
b
c
x1
b
a
c
x1
d
x1
b
c
x1
d
b
x1
c
c
x1
d
x1
c
x1
true
d
x1
c
x1
d
b
x1
c
c
x1
c
c
c
a
x1
d
d
x1
c
c
c
a
x1
d
x1
d
b
x1
c
x1
true
a
1
1
0
d
1
1
7314
b
1
1
2438
c
1
1
4876
d
1
1
2438
c
1
1
0
b
1
0
c
c
c
a
x1
d
d
x1
d
b
x1
c
c
x1
c
x1
a
a
x1
c
c
c
a
x1
d
d
x1
b
c
x1
b
a
c
x1
d
x1
b
c
x1
d
b
x1
c
c
x1
c
c
c
a
x1
d
d
x1
d
b
x1
c
c
x1
true
Failed!
NaTT
certifiable-1.6