a
c
x1
a
x1
d
a
x1
a
c
b
c
d
x1
a
c
b
c
x1
c
b
c
c
x1
c
x1
b
a
a
x1
d
c
x1
a
c
d
a
x1
2.2
d
a
x1
c
b
c
d
x1
d
c
x1
c
d
a
x1
c
x1
a
x1
a
c
b
c
x1
c
b
c
c
x1
a
c
x1
a
x1
c
x1
a
a
x1
d
c
x1
d
a
x1
a
c
b
c
x1
c
c
x1
d
c
x1
a
c
d
a
x1
d
a
x1
c
d
x1
d
a
x1
a
c
b
c
d
x1
d
c
x1
a
x1
d
a
x1
d
x1
true
d
a
x1
d
x1
d
c
x1
d
a
x1
true
a
1
1
1
d
1
0
b
1
2
c
1
1
2
d
1
1
0
c
1
0
a
1
0
c
x1
b
a
a
x1
a
c
x1
a
x1
a
c
b
c
x1
c
b
c
c
x1
d
a
x1
a
c
b
c
d
x1
false
d
a
x1
c
d
x1
false
d
c
x1
a
c
d
a
x1
false
d
c
x1
c
d
a
x1
false
d
c
x1
a
x1
false
d
a
x1
c
b
c
d
x1
false
c
x1
a
a
x1
a
c
x1
a
x1
a
c
b
c
x1
c
b
c
c
x1
c
x1
a
x1
a
c
b
c
x1
c
c
x1
true
Failed!
NaTT
certifiable-1.6