a
a
s
s
x1
s
s
a
a
x1
b
b
a
a
b
b
s
s
x1
a
a
b
b
s
s
a
a
x1
b
b
a
a
b
b
b
b
x1
a
a
b
b
a
a
b
b
x1
a
a
b
b
a
a
a
a
x1
b
b
a
a
b
b
a
a
x1
2.2
b
b
a
a
b
b
s
s
x1
a
b
b
s
s
a
a
x1
b
b
a
a
b
b
s
s
x1
a
x1
a
a
s
s
x1
a
a
x1
b
b
a
a
b
b
b
b
x1
b
b
a
a
b
b
x1
b
b
a
a
b
b
b
b
x1
a
a
b
b
x1
b
b
a
a
b
b
b
b
x1
a
b
b
x1
a
a
s
s
x1
a
x1
a
a
b
b
a
a
a
a
x1
b
a
a
x1
b
b
a
a
b
b
b
b
x1
a
a
b
b
a
a
b
b
x1
b
b
a
a
b
b
b
b
x1
b
a
a
b
b
x1
b
b
a
a
b
b
s
s
x1
a
a
x1
a
a
b
b
a
a
a
a
x1
a
a
b
b
a
a
x1
a
a
b
b
a
a
a
a
x1
b
b
a
a
x1
a
a
b
b
a
a
a
a
x1
b
a
a
b
b
a
a
x1
b
b
a
a
b
b
s
s
x1
b
b
s
s
a
a
x1
b
b
a
a
b
b
s
s
x1
a
a
b
b
s
s
a
a
x1
b
b
a
a
b
b
b
b
x1
a
b
b
a
a
b
b
x1
a
a
b
b
a
a
a
a
x1
b
b
a
a
b
b
a
a
x1
b
b
a
a
b
b
s
s
x1
b
s
s
a
a
x1
a
a
b
b
a
a
a
a
x1
a
b
b
a
a
x1
true
a
a
b
b
a
a
a
a
x1
a
b
b
a
a
x1
a
a
s
s
x1
a
x1
a
a
b
b
a
a
a
a
x1
b
b
a
a
b
b
a
a
x1
b
b
a
a
b
b
b
b
x1
a
b
b
x1
b
b
a
a
b
b
b
b
x1
a
b
b
a
a
b
b
x1
a
a
b
b
a
a
a
a
x1
b
a
a
b
b
a
a
x1
b
b
a
a
b
b
b
b
x1
a
a
b
b
x1
b
b
a
a
b
b
b
b
x1
b
b
a
a
b
b
x1
a
a
s
s
x1
a
a
x1
a
a
b
b
a
a
a
a
x1
b
b
a
a
x1
a
a
b
b
a
a
a
a
x1
a
a
b
b
a
a
x1
b
b
a
a
b
b
s
s
x1
a
x1
b
b
a
a
b
b
s
s
x1
a
a
x1
b
b
a
a
b
b
b
b
x1
b
a
a
b
b
x1
b
b
a
a
b
b
b
b
x1
a
a
b
b
a
a
b
b
x1
a
a
b
b
a
a
a
a
x1
b
a
a
x1
true
a
1
1
20538
s
1
1
16203
b
1
1
20538
a
1
1
0
b
1
1
0
b
b
a
a
b
b
b
b
x1
a
a
b
b
a
a
b
b
x1
a
a
b
b
a
a
a
a
x1
b
b
a
a
b
b
a
a
x1
a
a
b
b
a
a
a
a
x1
b
b
a
a
b
b
a
a
x1
a
a
s
s
x1
s
s
a
a
x1
b
b
a
a
b
b
b
b
x1
a
a
b
b
a
a
b
b
x1
b
b
a
a
b
b
s
s
x1
a
a
b
b
s
s
a
a
x1
a
a
b
b
a
a
a
a
x1
b
b
a
a
b
b
a
a
x1
b
b
a
a
b
b
b
b
x1
a
a
b
b
a
a
b
b
x1
true
2
1
a
1
0
0
1
1
1
1
28734
s
1
988
27553
b
1
1
1
0
0
1
28734
1
a
1
1
0
0
b
1
0
0
1
1
1
28732
0
a
a
b
b
a
a
a
a
x1
b
b
a
a
b
b
a
a
x1
a
a
s
s
x1
s
s
a
a
x1
b
b
a
a
b
b
b
b
x1
a
a
b
b
a
a
b
b
x1
b
b
a
a
b
b
s
s
x1
a
a
b
b
s
s
a
a
x1
b
b
a
a
b
b
s
s
x1
a
a
b
b
s
s
a
a
x1
false
b
b
a
a
b
b
s
s
x1
a
b
b
s
s
a
a
x1
false
b
b
a
a
b
b
s
s
x1
b
b
s
s
a
a
x1
false
b
b
a
a
b
b
s
s
x1
b
s
s
a
a
x1
false
NaTT
certifiable-1.6