from
X
cons
X
n__from
n__s
X
first
0
Z
nil
first
s
X
cons
Y
Z
cons
Y
n__first
X
activate
Z
sel
0
cons
X
Z
X
sel
s
X
cons
Y
Z
sel
X
activate
Z
from
X
n__from
X
s
X
n__s
X
first
X1
X2
n__first
X1
X2
activate
n__from
X
from
activate
X
activate
n__s
X
s
activate
X
activate
n__first
X1
X2
first
activate
X1
activate
X2
activate
X
X
2.2
activate
n__from
X
activate
X
activate
n__s
X
s
activate
X
sel
s
X
cons
Y
Z
activate
Z
activate
n__s
X
activate
X
first
s
X
cons
Y
Z
activate
Z
activate
n__first
X1
X2
activate
X2
activate
n__first
X1
X2
first
activate
X1
activate
X2
activate
n__from
X
from
activate
X
sel
s
X
cons
Y
Z
sel
X
activate
Z
activate
n__first
X1
X2
activate
X1
true
sel
s
X
cons
Y
Z
sel
X
activate
Z
true
s
1
1
1
n__first
2
2
activate
1
1
n__from
1
3
activate
1
0
n__s
1
1
2
0
0
0
sel
2
1
0
from
1
2
sel
2
0
s
1
0
first
2
0
nil
0
2
first
2
1
1
from
1
0
cons
2
1
3
sel
s
X
cons
Y
Z
activate
Z
false
activate
n__first
X1
X2
activate
X1
activate
n__first
X1
X2
first
activate
X1
activate
X2
activate
n__first
X1
X2
activate
X2
first
s
X
cons
Y
Z
activate
Z
activate
n__s
X
activate
X
activate
n__from
X
activate
X
true
s
1
1
0
n__first
2
1
2
1144
activate
1
1
0
n__from
1
1
28101
activate
1
1
0
n__s
1
1
0
0
0
0
sel
2
0
from
1
1
28101
sel
2
0
s
1
0
first
2
2
1143
nil
0
0
first
2
1
2
1144
from
1
0
cons
2
2
0
activate
n__s
X
activate
X
first
X1
X2
n__first
X1
X2
from
X
cons
X
n__from
n__s
X
first
s
X
cons
Y
Z
cons
Y
n__first
X
activate
Z
activate
n__s
X
s
activate
X
s
X
n__s
X
activate
X
X
activate
n__first
X1
X2
first
activate
X1
activate
X2
activate
n__from
X
from
activate
X
from
X
n__from
X
first
0
Z
nil
activate
n__s
X
activate
X
true
s
1
1
8946
n__first
2
2
1144
activate
1
1
0
n__from
1
1
activate
1
1
0
n__s
1
1
8946
0
0
0
sel
2
0
from
1
1
sel
2
0
s
1
0
first
2
2
1143
nil
0
0
first
2
2
1144
from
1
0
cons
2
2
0
first
X1
X2
n__first
X1
X2
from
X
cons
X
n__from
n__s
X
first
s
X
cons
Y
Z
cons
Y
n__first
X
activate
Z
activate
n__s
X
s
activate
X
s
X
n__s
X
activate
X
X
activate
n__first
X1
X2
first
activate
X1
activate
X2
activate
n__from
X
from
activate
X
from
X
n__from
X
first
0
Z
nil
activate
n__from
X
from
activate
X
false
activate
n__s
X
s
activate
X
false
NaTT
certifiable-1.6