__
__
X
Y
Z
__
X
__
Y
Z
__
X
nil
X
__
nil
X
X
U11
tt
U12
tt
U12
tt
tt
isNePal
__
I
__
P
I
U11
tt
activate
X
X
2.2
__
__
X
Y
Z
__
X
__
Y
Z
__
__
X
Y
Z
__
Y
Z
isNePal
__
I
__
P
I
U11
tt
U11
tt
U12
tt
true
isNePal
__
I
__
P
I
U11
tt
false
U11
tt
U12
tt
false
__
__
X
Y
Z
__
Y
Z
__
__
X
Y
Z
__
X
__
Y
Z
true
U11
1
0
activate
1
0
activate
1
0
__
2
1
0
isNePal
1
0
U12
1
0
U12
1
0
isNePal
1
0
nil
0
1
U11
1
0
tt
0
0
__
2
1
2
1
NaTT
certifiable-1.6