from
X
cons
X
from
s
X
after
0
XS
XS
after
s
N
cons
X
XS
after
N
XS
2.2
from
X
from
s
X
after
s
N
cons
X
XS
after
N
XS
true
after
s
N
cons
X
XS
after
N
XS
true
s
1
1
after
2
0
0
0
0
from
1
0
after
2
2
0
from
1
0
cons
2
2
1
from
X
from
s
X
true
Failed!
NaTT
certifiable-1.6