b
b
d
d
b
b
x1
c
c
d
d
b
b
x1
b
b
a
a
c
c
x1
b
b
c
c
x1
a
a
d
d
x1
d
d
c
c
x1
b
b
b
b
b
b
x1
a
a
b
b
c
c
x1
d
d
c
c
x1
b
b
d
d
x1
d
d
c
c
x1
d
d
b
b
d
d
x1
d
d
a
a
c
c
x1
b
b
b
b
x1
2.2
b
b
a
a
c
c
x1
b
c
c
x1
d
d
c
c
x1
b
d
d
x1
d
d
c
c
x1
b
b
d
d
x1
d
d
a
a
c
c
x1
b
b
b
b
x1
d
d
a
a
c
c
x1
b
b
x1
d
d
a
a
c
c
x1
b
x1
d
d
c
c
x1
b
d
d
x1
b
b
b
b
b
b
x1
a
b
b
c
c
x1
d
d
c
c
x1
d
d
x1
d
d
a
a
c
c
x1
b
b
b
x1
d
d
c
c
x1
b
b
d
d
x1
b
b
b
b
b
b
x1
b
c
c
x1
a
a
d
d
x1
d
d
c
c
x1
b
b
b
b
b
b
x1
a
a
b
b
c
c
x1
b
b
b
b
b
b
x1
b
b
c
c
x1
d
d
c
c
x1
d
x1
d
d
c
c
x1
d
d
b
b
d
d
x1
b
b
a
a
c
c
x1
b
b
c
c
x1
d
d
c
c
x1
d
x1
d
d
c
c
x1
d
d
x1
d
d
c
c
x1
d
b
b
d
d
x1
a
a
d
d
x1
d
c
c
x1
true
a
a
d
d
x1
d
c
c
x1
false
a
a
d
d
x1
d
d
c
c
x1
false
d
d
c
c
x1
d
b
b
d
d
x1
d
d
c
c
x1
d
d
x1
d
d
c
c
x1
d
x1
d
d
c
c
x1
d
d
b
b
d
d
x1
d
d
c
c
x1
d
x1
d
d
c
c
x1
d
d
x1
true
a
1
1
20163
d
1
1
0
b
1
1
20163
c
1
1
20163
d
1
1
0
a
1
0
b
1
0
d
d
c
c
x1
d
d
b
b
d
d
x1
d
d
c
c
x1
d
b
b
d
d
x1
b
b
b
b
b
b
x1
a
a
b
b
c
c
x1
b
b
d
d
b
b
x1
c
c
d
d
b
b
x1
a
a
d
d
x1
d
d
c
c
x1
d
d
c
c
x1
b
b
d
d
x1
d
d
a
a
c
c
x1
b
b
b
b
x1
d
d
c
c
x1
d
d
b
b
d
d
x1
b
b
a
a
c
c
x1
b
b
c
c
x1
d
d
c
c
x1
d
b
b
d
d
x1
d
d
c
c
x1
d
d
b
b
d
d
x1
true
a
1
1
0
d
1
31123
b
1
31122
c
1
1
d
1
1
0
a
1
0
b
1
0
d
d
c
c
x1
d
d
b
b
d
d
x1
b
b
b
b
b
b
x1
a
a
b
b
c
c
x1
b
b
d
d
b
b
x1
c
c
d
d
b
b
x1
a
a
d
d
x1
d
d
c
c
x1
d
d
c
c
x1
b
b
d
d
x1
d
d
a
a
c
c
x1
b
b
b
b
x1
d
d
c
c
x1
d
d
b
b
d
d
x1
b
b
a
a
c
c
x1
b
b
c
c
x1
d
d
c
c
x1
d
d
b
b
d
d
x1
true
Failed!
NaTT
certifiable-1.6