a
a
x1
b
c
x1
b
b
x1
c
d
x1
b
x1
a
x1
c
c
x1
d
f
x1
d
d
x1
f
f
f
x1
d
x1
b
x1
f
f
x1
g
a
x1
g
g
x1
a
x1
2.2
b
b
x1
d
x1
d
d
x1
f
f
f
x1
c
c
x1
d
f
x1
b
x1
a
x1
a
a
x1
c
x1
g
g
x1
a
x1
c
c
x1
f
x1
d
d
x1
f
f
x1
a
a
x1
b
c
x1
f
f
x1
a
x1
d
x1
b
x1
b
b
x1
c
d
x1
d
d
x1
f
x1
f
f
x1
g
a
x1
true
f
f
x1
g
a
x1
c
c
x1
f
x1
g
g
x1
a
x1
d
d
x1
f
x1
b
b
x1
c
d
x1
d
x1
b
x1
a
a
x1
c
x1
b
x1
a
x1
c
c
x1
d
f
x1
d
d
x1
f
f
f
x1
f
f
x1
a
x1
a
a
x1
b
c
x1
d
d
x1
f
f
x1
b
b
x1
d
x1
true
a
1
1
96
d
1
1
108
b
1
1
102
c
1
1
90
f
1
1
72
d
1
1
62
f
1
1
25
g
1
1
0
c
1
1
45
a
1
1
47
g
1
1
48
b
1
1
52
c
c
x1
d
f
x1
g
g
x1
a
x1
a
a
x1
b
c
x1
b
x1
a
x1
d
d
x1
f
f
f
x1
f
f
x1
g
a
x1
d
x1
b
x1
b
b
x1
c
d
x1
NaTT
certifiable-1.6