a
b
a
a
x1
c
b
a
b
a
x1
a
c
b
x1
a
a
b
c
b
a
x1
2.2
a
c
b
x1
a
b
c
b
a
x1
a
c
b
x1
a
x1
a
c
b
x1
a
a
b
c
b
a
x1
a
b
a
a
x1
a
b
a
x1
true
a
c
b
x1
a
x1
true
a
1
0
b
1
1
1
c
1
1
0
a
1
1
0
a
c
b
x1
a
a
b
c
b
a
x1
false
a
b
a
a
x1
a
b
a
x1
true
2
1
a
1
1
1
1
1
1
1
246846
b
1
1
1
0
0
1
92703
26135
c
1
0
1
0
1
1
45725
502860
a
1
1
1
1
1
1
0
0
a
b
a
a
x1
c
b
a
b
a
x1
a
c
b
x1
a
a
b
c
b
a
x1
a
c
b
x1
a
b
c
b
a
x1
false
NaTT
certifiable-1.6