a
a
x1
b
c
x1
b
b
x1
c
d
x1
c
c
x1
d
d
d
x1
d
d
d
x1
a
c
x1
2.2
b
b
x1
d
x1
a
a
x1
b
c
x1
d
d
d
x1
c
x1
a
a
x1
c
x1
c
c
x1
d
x1
c
c
x1
d
d
d
x1
b
b
x1
c
d
x1
d
d
d
x1
a
c
x1
c
c
x1
d
d
x1
true
c
c
x1
d
d
x1
d
d
d
x1
a
c
x1
b
b
x1
c
d
x1
c
c
x1
d
d
d
x1
d
d
d
x1
c
x1
a
a
x1
b
c
x1
c
c
x1
d
x1
a
a
x1
c
x1
b
b
x1
d
x1
true
a
1
1
63726
d
1
1
42484
b
1
1
63726
c
1
1
63726
d
1
1
0
c
1
1
21243
a
1
1
3
b
1
1
2
d
d
d
x1
a
c
x1
a
a
x1
b
c
x1
c
c
x1
d
d
d
x1
b
b
x1
c
d
x1
NaTT
certifiable-1.6