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b
b
b
a
b
b
b
x1
a
b
b
a
a
x1
b
b
a
b
a
b
b
b
a
x1
a
b
a
a
a
x1
b
a
a
b
a
b
b
a
a
x1
a
a
b
b
a
x1
a
b
b
b
a
b
a
b
b
x1
a
a
a
b
a
x1
a
a
b
b
a
b
a
a
b
x1
a
b
a
b
a
x1
b
a
b
b
a
b
b
a
b
x1
a
b
a
a
x1
b
a
b
a
b
b
a
x1
a
a
a
x1
a
b
a
b
a
x1
a
a
x1
a
b
x1
false
a
a
b
a
x1
a
b
x1
false
a
a
b
a
x1
a
b
a
b
x1
false
a
a
b
a
x1
a
b
b
a
b
a
b
x1
false
a
a
b
b
a
x1
a
b
b
x1
false
a
a
b
b
a
x1
a
b
a
b
b
x1
false
a
b
a
b
a
x1
a
b
x1
true
2
1
a
1
1
1
0
1
1
1
1
b
1
0
0
0
1
1
0
0
a
1
0
0
1
0
1
0
0
a
a
a
a
x1
a
a
b
a
b
a
a
x1
a
b
b
b
a
x1
b
b
b
b
a
b
b
b
b
x1
a
a
a
a
a
x1
a
a
a
b
a
b
a
a
a
x1
a
a
x1
b
a
b
x1
a
b
a
x1
b
b
a
b
b
x1
a
a
b
a
x1
a
b
b
a
b
a
b
x1
a
a
b
a
a
x1
a
b
a
b
a
b
a
b
a
x1
a
b
b
a
x1
b
b
b
a
b
b
b
x1
a
b
b
a
a
x1
b
b
a
b
a
b
b
b
a
x1
a
b
a
a
a
x1
b
a
a
b
a
b
b
a
a
x1
a
a
b
b
a
x1
a
b
b
b
a
b
a
b
b
x1
a
a
a
b
a
x1
a
a
b
b
a
b
a
a
b
x1
a
b
a
b
a
x1
b
a
b
b
a
b
b
a
b
x1
a
b
a
a
x1
b
a
b
a
b
b
a
x1
a
a
a
x1
a
b
a
b
a
x1
a
b
a
x1
a
b
b
x1
false
a
b
a
b
a
x1
a
b
b
a
b
x1
false
a
b
a
b
a
x1
a
b
b
a
b
b
a
b
x1
false
a
a
b
b
a
x1
a
b
b
b
a
b
a
b
b
x1
false
a
b
b
a
x1
a
b
b
b
x1
false
a
b
b
a
a
x1
a
b
b
b
a
x1
false
a
b
b
b
a
x1
a
b
b
b
b
x1
false
NaTT
certifiable-1.6