c
c
x1
a
a
a
b
b
b
x1
b
b
b
a
x1
b
b
b
b
b
b
b
b
x1
b
b
c
c
x1
c
c
c
a
a
a
a
x1
2.2
b
b
b
a
x1
b
b
b
b
b
b
b
x1
b
b
b
a
x1
b
b
b
x1
c
c
x1
b
b
x1
b
b
c
c
x1
c
c
c
a
a
a
a
x1
b
b
c
c
x1
c
a
a
a
a
x1
c
c
x1
b
b
b
x1
c
c
x1
b
x1
b
b
b
a
x1
b
b
x1
b
b
c
c
x1
c
c
a
a
a
a
x1
b
b
b
a
x1
b
b
b
b
x1
b
b
b
a
x1
b
b
b
b
b
b
x1
b
b
b
a
x1
b
b
b
b
b
b
b
b
x1
b
b
b
a
x1
b
x1
b
b
b
a
x1
b
b
b
b
b
x1
true
b
b
b
a
x1
b
b
b
b
b
x1
c
c
x1
b
x1
c
c
x1
b
b
b
x1
b
b
b
a
x1
b
x1
b
b
b
a
x1
b
b
b
b
b
b
b
b
x1
b
b
b
a
x1
b
b
b
b
b
b
x1
b
b
c
c
x1
c
c
c
a
a
a
a
x1
c
c
x1
b
b
x1
b
b
b
a
x1
b
b
b
x1
b
b
b
a
x1
b
b
b
b
x1
b
b
c
c
x1
c
c
a
a
a
a
x1
b
b
b
a
x1
b
b
x1
b
b
b
a
x1
b
b
b
b
b
b
b
x1
true
2
1
a
1
0
0
0
1
1
1002
2961
b
1
0
0
1
1
1
23508
592
c
1
0
1
1
0
1
12256
182
c
1
1
0
0
0
1
0
0
b
1
0
0
1
0
1
11071
0
c
c
x1
a
a
a
b
b
b
x1
b
b
c
c
x1
c
c
c
a
a
a
a
x1
b
b
b
a
x1
b
b
b
b
b
b
b
b
x1
b
b
c
c
x1
c
a
a
a
a
x1
false
NaTT
certifiable-1.6