and
true
X
activate
X
and
false
Y
false
if
true
X
Y
activate
X
if
false
X
Y
activate
Y
add
0
X
activate
X
add
s
X
Y
s
n__add
activate
X
activate
Y
first
0
X
nil
first
s
X
cons
Y
Z
cons
activate
Y
n__first
activate
X
activate
Z
from
X
cons
activate
X
n__from
n__s
activate
X
add
X1
X2
n__add
X1
X2
first
X1
X2
n__first
X1
X2
from
X
n__from
X
s
X
n__s
X
activate
n__add
X1
X2
add
activate
X1
X2
activate
n__first
X1
X2
first
activate
X1
activate
X2
activate
n__from
X
from
X
activate
n__s
X
s
X
activate
X
X
and
2
true
0
activate
1
false
0
if
3
add
2
0
0
s
1
n__add
2
first
2
nil
0
cons
2
n__first
2
from
1
n__from
1
n__s
1
FULL