b
b
x1
c
d
x1
c
c
x1
d
d
d
x1
c
x1
g
x1
d
d
x1
c
f
x1
d
d
d
x1
g
c
x1
f
x1
a
g
x1
g
x1
d
a
b
x1
g
g
x1
b
c
x1
2.2
c
c
x1
d
d
x1
g
x1
b
x1
g
g
x1
c
x1
c
x1
g
x1
b
b
x1
d
x1
g
g
x1
b
c
x1
d
d
x1
c
f
x1
d
d
d
x1
g
c
x1
b
b
x1
c
d
x1
g
x1
d
a
b
x1
c
c
x1
d
x1
c
c
x1
d
d
d
x1
d
d
d
x1
c
x1
d
d
x1
f
x1
f
x1
g
x1
true
f
x1
g
x1
d
d
x1
c
f
x1
d
d
x1
f
x1
g
g
x1
b
c
x1
d
d
d
x1
c
x1
c
c
x1
d
d
d
x1
c
c
x1
d
x1
b
b
x1
d
x1
c
x1
g
x1
g
g
x1
c
x1
g
x1
b
x1
b
b
x1
c
d
x1
d
d
d
x1
g
c
x1
c
c
x1
d
d
x1
true
a
1
1539
d
1
1
4882
b
1
1
7323
c
1
1
7323
f
1
1539
d
1
1
0
f
1
1
4
g
1
1
3
c
1
1
2442
g
1
1
7323
b
1
1
2
d
d
x1
c
f
x1
g
g
x1
b
c
x1
b
b
x1
c
d
x1
c
x1
g
x1
d
d
d
x1
g
c
x1
g
x1
d
a
b
x1
f
x1
a
g
x1
c
c
x1
d
d
d
x1
g
x1
d
a
b
x1
false
NaTT
certifiable-1.6