b
a
a
x1
a
b
c
x1
c
a
x1
a
c
x1
b
c
a
x1
a
b
c
x1
c
b
x1
b
a
x1
a
c
b
x1
c
b
a
x1
2.2
c
a
x1
c
x1
b
c
a
x1
a
b
c
x1
c
b
x1
a
x1
b
a
a
x1
a
b
c
x1
b
a
a
x1
c
x1
c
b
x1
b
a
x1
b
c
a
x1
b
c
x1
b
a
a
x1
b
c
x1
a
c
b
x1
a
x1
a
c
b
x1
c
b
a
x1
c
a
x1
a
c
x1
b
c
a
x1
c
x1
a
c
b
x1
b
a
x1
true
a
c
b
x1
b
a
x1
c
b
x1
b
a
x1
b
c
a
x1
c
x1
c
a
x1
a
c
x1
a
c
b
x1
c
b
a
x1
b
a
a
x1
c
x1
b
a
a
x1
a
b
c
x1
c
b
x1
a
x1
b
c
a
x1
a
b
c
x1
a
c
b
x1
a
x1
b
a
a
x1
b
c
x1
b
c
a
x1
b
c
x1
c
a
x1
c
x1
true
a
1
1
8856
b
1
1
2942
c
1
1
8856
c
1
1
5914
a
1
1
5914
b
1
1
0
b
c
a
x1
a
b
c
x1
b
a
a
x1
a
b
c
x1
a
c
b
x1
c
b
a
x1
c
a
x1
a
c
x1
c
b
x1
b
a
x1
c
b
x1
b
a
x1
b
a
a
x1
a
b
c
x1
b
c
a
x1
a
b
c
x1
a
c
b
x1
c
b
a
x1
c
a
x1
a
c
x1
c
b
x1
b
a
x1
b
a
a
x1
a
b
c
x1
b
c
a
x1
a
b
c
x1
a
c
b
x1
c
b
a
x1
c
a
x1
a
c
x1
true
a
1
1
0
b
1
1
c
1
25909
c
1
25909
a
1
1
0
b
1
2
c
a
x1
a
c
x1
a
c
b
x1
c
b
a
x1
c
b
x1
b
a
x1
b
a
a
x1
a
b
c
x1
b
c
a
x1
a
b
c
x1
a
c
b
x1
c
b
a
x1
c
a
x1
a
c
x1
a
c
b
x1
c
b
a
x1
c
a
x1
a
c
x1
true
2
1
a
1
0
1
1
1
1
1
41067
b
1
0
1
1
1
1
3
41069
c
1
0
1
1
1
1
1
41065
c
1
1
1
1
1
1
0
0
a
1
1
1
1
1
1
1
2
b
1
0
0
c
b
x1
b
a
x1
b
a
a
x1
a
b
c
x1
b
c
a
x1
a
b
c
x1
a
c
b
x1
c
b
a
x1
c
a
x1
a
c
x1
NaTT
certifiable-1.6