a
a
x1
b
b
b
x1
a
x1
c
d
x1
b
b
x1
c
c
c
x1
c
c
x1
d
d
d
x1
e
d
x1
a
b
c
d
e
x1
b
x1
d
d
x1
e
c
x1
b
a
a
e
x1
c
d
d
x1
a
x1
2.2
e
c
x1
b
a
a
e
x1
e
d
x1
a
b
c
d
e
x1
a
a
x1
b
b
b
x1
e
d
x1
e
x1
b
b
x1
c
c
x1
b
b
x1
c
x1
a
a
x1
b
b
x1
e
d
x1
b
c
d
e
x1
b
b
x1
c
c
c
x1
e
c
x1
e
x1
c
d
d
x1
a
x1
e
c
x1
a
a
e
x1
a
x1
c
d
x1
e
d
x1
c
d
e
x1
a
a
x1
b
x1
e
c
x1
a
e
x1
true
e
d
x1
e
x1
e
c
x1
e
x1
true
a
1
0
d
1
1
1
b
1
0
e
1
1
0
c
1
1
1
c
1
0
e
1
0
a
1
0
b
1
0
e
c
x1
a
a
e
x1
false
e
c
x1
a
e
x1
false
e
d
x1
a
b
c
d
e
x1
false
e
d
x1
c
d
e
x1
false
e
d
x1
b
c
d
e
x1
false
e
c
x1
b
a
a
e
x1
false
a
a
x1
b
b
x1
a
a
x1
b
x1
b
b
x1
c
x1
a
x1
c
d
x1
c
d
d
x1
a
x1
b
b
x1
c
c
x1
a
a
x1
b
b
b
x1
b
b
x1
c
c
c
x1
true
a
1
1
42
d
1
1
12
b
1
1
27
e
1
0
c
1
1
18
c
1
1
0
e
1
0
a
1
1
23
b
1
1
10
c
c
x1
d
d
d
x1
c
d
d
x1
a
x1
a
a
x1
b
b
b
x1
b
b
x1
c
c
c
x1
b
x1
d
d
x1
a
x1
c
d
x1
NaTT
certifiable-1.6