and
tt
tt
tt
is_nat
0
tt
is_nat
s
x
is_nat
x
is_natlist
nil
tt
is_natlist
cons
x
xs
and
is_nat
x
is_natlist
xs
from
x
fromCond
is_natlist
x
x
fromCond
tt
cons
x
xs
from
cons
s
x
cons
x
xs
and
2
tt
0
is_nat
1
0
0
s
1
is_natlist
1
nil
0
cons
2
from
1
fromCond
2
INNERMOST
TRS//AProVE_10/challenge_fab.trs