a
b
x1
b
c
a
x1
b
c
x1
c
b
b
x1
b
a
x1
a
c
b
x1
2.2
b
c
x1
b
x1
a
b
x1
a
x1
a
b
x1
b
c
a
x1
b
a
x1
a
c
b
x1
b
c
x1
b
b
x1
b
a
x1
b
x1
true
a
b
x1
a
x1
true
a
1
0
b
1
1
1
c
1
0
a
1
1
0
b
1
0
a
b
x1
b
c
a
x1
false
b
a
x1
b
x1
b
c
x1
b
b
x1
b
c
x1
b
x1
true
a
1
1
7720
b
1
1
0
c
1
1
0
a
1
0
b
1
1
0
b
c
x1
b
x1
b
c
x1
b
b
x1
a
b
x1
b
c
a
x1
b
a
x1
a
c
b
x1
b
c
x1
c
b
b
x1
b
c
x1
b
x1
b
c
x1
b
b
x1
true
2
1
a
1
1
1
0
0
1
32529
32528
b
1
1
0
1
1
1
1
0
c
1
0
0
0
1
1
0
1
a
1
0
0
b
1
0
0
1
0
1
0
0
a
b
x1
b
c
a
x1
b
a
x1
a
c
b
x1
b
c
x1
c
b
b
x1
b
a
x1
a
c
b
x1
false
NaTT
certifiable-1.6