a
a
b
x1
b
a
x1
b
a
a
x1
a
a
a
b
x1
a
c
x1
c
b
x1
2.2
b
a
a
x1
a
a
b
x1
a
a
b
x1
b
a
x1
a
a
b
x1
a
x1
a
c
x1
b
x1
b
a
a
x1
a
b
x1
b
a
a
x1
a
a
a
b
x1
b
a
a
x1
b
x1
true
b
a
a
x1
b
x1
b
a
a
x1
a
a
a
b
x1
b
a
a
x1
a
b
x1
a
a
b
x1
b
a
x1
a
c
x1
b
x1
a
a
b
x1
a
x1
b
a
a
x1
a
a
b
x1
true
a
1
1
0
b
1
1
0
c
1
1
1
a
1
1
0
b
1
1
0
b
a
a
x1
a
a
b
x1
a
a
b
x1
a
x1
a
a
b
x1
b
a
x1
b
a
a
x1
a
b
x1
b
a
a
x1
a
a
a
b
x1
b
a
a
x1
b
x1
a
a
b
x1
b
a
x1
a
c
x1
c
b
x1
b
a
a
x1
a
a
a
b
x1
a
a
b
x1
a
x1
a
a
b
x1
b
a
x1
b
a
a
x1
b
x1
b
a
a
x1
a
b
x1
b
a
a
x1
a
a
b
x1
b
a
a
x1
a
a
a
b
x1
true
a
1
1
0
b
1
1
11798
c
1
8856
a
1
1
0
b
1
1
11798
b
a
a
x1
a
a
a
b
x1
b
a
a
x1
a
a
b
x1
b
a
a
x1
a
b
x1
b
a
a
x1
b
x1
a
a
b
x1
b
a
x1
a
a
b
x1
b
a
x1
a
c
x1
c
b
x1
b
a
a
x1
a
a
a
b
x1
a
a
b
x1
b
a
x1
b
a
a
x1
b
x1
b
a
a
x1
a
b
x1
b
a
a
x1
a
a
b
x1
b
a
a
x1
a
a
a
b
x1
true
2
1
a
1
0
1
1
0
1
5599
1
b
1
1
1
1
1
1
49509
43912
c
1
1
2
a
1
1
0
0
0
1
0
14
b
1
1
0
1
0
1
43910
14
a
a
b
x1
b
a
x1
a
c
x1
c
b
x1
b
a
a
x1
a
a
a
b
x1
NaTT
certifiable-1.6