active
zeros
mark
cons
0
zeros
active
U11
tt
L
mark
U12
tt
L
active
U12
tt
L
mark
s
length
L
active
length
nil
mark
0
active
length
cons
N
L
mark
U11
tt
L
active
cons
X1
X2
cons
active
X1
X2
active
U11
X1
X2
U11
active
X1
X2
active
U12
X1
X2
U12
active
X1
X2
active
s
X
s
active
X
active
length
X
length
active
X
cons
mark
X1
X2
mark
cons
X1
X2
U11
mark
X1
X2
mark
U11
X1
X2
U12
mark
X1
X2
mark
U12
X1
X2
s
mark
X
mark
s
X
length
mark
X
mark
length
X
proper
zeros
ok
zeros
proper
cons
X1
X2
cons
proper
X1
proper
X2
proper
0
ok
0
proper
U11
X1
X2
U11
proper
X1
proper
X2
proper
tt
ok
tt
proper
U12
X1
X2
U12
proper
X1
proper
X2
proper
s
X
s
proper
X
proper
length
X
length
proper
X
proper
nil
ok
nil
cons
ok
X1
ok
X2
ok
cons
X1
X2
U11
ok
X1
ok
X2
ok
U11
X1
X2
U12
ok
X1
ok
X2
ok
U12
X1
X2
s
ok
X
ok
s
X
length
ok
X
ok
length
X
top
mark
X
top
proper
X
top
ok
X
top
active
X
active
1
zeros
0
mark
1
cons
2
0
0
U11
2
tt
0
U12
2
s
1
length
1
nil
0
proper
1
ok
1
top
1
INNERMOST
./TRS/TRCSR/inn/LengthOfFiniteLists_nosorts_noand_C.trs