b
a
x1
b
b
x1
b
a
b
x1
b
a
a
x1
a
a
a
x1
a
b
b
x1
2.2
b
a
b
x1
a
a
x1
a
a
a
x1
b
x1
b
a
x1
b
b
x1
a
a
a
x1
b
b
x1
b
a
b
x1
a
x1
b
a
b
x1
b
a
a
x1
b
a
x1
b
x1
a
a
a
x1
a
b
b
x1
true
a
a
a
x1
a
b
b
x1
b
a
x1
b
x1
b
a
b
x1
b
a
a
x1
b
a
b
x1
a
x1
a
a
a
x1
b
x1
a
a
a
x1
b
b
x1
b
a
x1
b
b
x1
b
a
b
x1
a
a
x1
true
a
1
1
2438
b
1
1
2438
a
1
1
0
b
1
1
2437
b
a
x1
b
b
x1
b
a
b
x1
b
a
a
x1
a
a
a
x1
a
b
b
x1
b
a
x1
b
b
x1
a
a
a
x1
a
b
b
x1
b
a
b
x1
b
a
a
x1
a
a
a
x1
a
b
b
x1
true
a
1
1
40651
b
1
81301
a
1
1
0
b
1
1
2437
b
a
x1
b
b
x1
a
a
a
x1
a
b
b
x1
b
a
b
x1
b
a
a
x1
b
a
x1
b
b
x1
b
a
b
x1
b
a
a
x1
true
a
1
30613
b
1
0
a
1
1
0
b
1
1
2437
b
a
b
x1
b
a
a
x1
b
a
x1
b
b
x1
a
a
a
x1
a
b
b
x1
b
a
b
x1
b
a
a
x1
b
a
b
x1
b
a
a
x1
true
2
1
a
1
0
1
1
0
1
30809
1
b
1
0
1
0
0
1
1
30809
a
1
0
0
b
1
1
0
0
0
1
0
0
b
a
x1
b
b
x1
a
a
a
x1
a
b
b
x1
b
a
b
x1
b
a
a
x1
NaTT
certifiable-1.6