a
a
x1
d
c
x1
a
b
x1
c
c
c
x1
b
b
x1
a
c
c
x1
c
c
x1
b
x1
c
d
x1
a
a
x1
d
d
x1
b
a
c
x1
2.2
a
b
x1
c
c
x1
d
d
x1
c
x1
a
a
x1
c
x1
b
b
x1
a
c
c
x1
b
b
x1
c
x1
a
a
x1
d
c
x1
c
c
x1
b
x1
c
d
x1
a
a
x1
b
b
x1
c
c
x1
d
d
x1
a
c
x1
a
b
x1
c
x1
a
b
x1
c
c
c
x1
c
d
x1
a
x1
d
d
x1
b
a
c
x1
true
d
d
x1
b
a
c
x1
c
c
x1
b
x1
a
a
x1
d
c
x1
c
d
x1
a
x1
a
b
x1
c
c
c
x1
a
b
x1
c
x1
b
b
x1
c
x1
b
b
x1
a
c
c
x1
a
a
x1
c
x1
d
d
x1
c
x1
d
d
x1
a
c
x1
b
b
x1
c
c
x1
c
d
x1
a
a
x1
a
b
x1
c
c
x1
true
a
1
1
19502
d
1
1
26816
b
1
1
21939
c
1
1
12188
d
1
1
9751
c
1
1
0
a
1
1
2438
b
1
1
4876
c
c
x1
b
x1
a
a
x1
d
c
x1
b
b
x1
a
c
c
x1
c
d
x1
a
a
x1
d
d
x1
b
a
c
x1
a
b
x1
c
c
c
x1
NaTT
certifiable-1.6