b
c
a
x1
a
b
a
b
c
x1
b
x1
c
c
x1
c
d
x1
a
b
c
a
x1
a
a
x1
a
c
b
a
x1
2.2
b
x1
c
x1
c
d
x1
a
x1
a
a
x1
c
b
a
x1
b
c
a
x1
a
b
c
x1
b
c
a
x1
c
x1
a
a
x1
a
c
b
a
x1
a
a
x1
b
a
x1
b
c
a
x1
a
b
a
b
c
x1
b
c
a
x1
b
c
x1
c
d
x1
c
a
x1
c
d
x1
a
b
c
a
x1
b
x1
c
c
x1
b
c
a
x1
b
a
b
c
x1
c
d
x1
b
c
a
x1
true
c
d
x1
b
c
a
x1
a
a
x1
b
a
x1
a
a
x1
a
c
b
a
x1
b
c
a
x1
b
a
b
c
x1
b
x1
c
c
x1
c
d
x1
a
b
c
a
x1
b
c
a
x1
c
x1
b
c
a
x1
a
b
c
x1
a
a
x1
c
b
a
x1
c
d
x1
a
x1
c
d
x1
c
a
x1
b
c
a
x1
b
c
x1
b
c
a
x1
a
b
a
b
c
x1
b
x1
c
x1
true
a
1
1
0
d
1
1
2
b
1
1
0
c
1
1
0
c
1
1
0
a
1
1
1
b
1
1
1
b
c
a
x1
a
b
a
b
c
x1
b
c
a
x1
b
c
x1
b
c
a
x1
a
b
c
x1
b
c
a
x1
b
a
b
c
x1
a
a
x1
a
c
b
a
x1
a
a
x1
b
a
x1
a
a
x1
a
c
b
a
x1
b
c
a
x1
a
b
a
b
c
x1
c
d
x1
a
b
c
a
x1
b
x1
c
c
x1
a
a
x1
b
a
x1
a
a
x1
a
c
b
a
x1
b
c
a
x1
b
c
x1
b
c
a
x1
a
b
c
x1
b
c
a
x1
b
a
b
c
x1
b
c
a
x1
a
b
a
b
c
x1
true
a
1
1
d
1
1
0
b
1
1
c
1
8368
c
1
0
a
1
8367
b
1
1
0
b
c
a
x1
b
c
x1
a
a
x1
a
c
b
a
x1
a
a
x1
a
c
b
a
x1
c
d
x1
a
b
c
a
x1
a
a
x1
a
c
b
a
x1
true
b
1
1
a
1
1
d
1
1
1
b
1
1
c
1
0
c
1
0
a
1
0
1
a
1
1
d
1
1
2
b
1
1
0
c
1
1
0
c
1
1
a
1
1
1
a
a
x1
a
c
b
a
x1
b
c
a
x1
a
b
a
b
c
x1
c
d
x1
a
b
c
a
x1
b
x1
c
c
x1
b
c
a
x1
b
c
x1
true
Failed!
NaTT
certifiable-1.6