f
f
x
f
x
f
s
x
f
x
g
s
0
g
f
s
0
2.2
g
s
0
g
f
s
0
g
s
0
f
s
0
f
s
x
f
x
true
g
s
0
g
f
s
0
true
s
1
2
f
1
1
0
0
1
f
1
0
g
1
1
0
g
1
0
f
f
x
f
x
f
s
x
f
x
g
s
0
f
s
0
false
f
s
x
f
x
true
s
1
1
2
f
1
1
0
0
1
f
1
1
0
g
1
1
0
g
1
0
f
f
x
f
x
f
s
x
f
x
NaTT
certifiable-1.6