dbl
0
0
dbl
s
X
s
s
dbl
X
dbls
nil
nil
dbls
cons
X
Y
cons
dbl
X
dbls
Y
sel
0
cons
X
Y
X
sel
s
X
cons
Y
Z
sel
X
Z
indx
nil
X
nil
indx
cons
X
Y
Z
cons
sel
X
Z
indx
Y
Z
from
X
cons
X
from
s
X
dbl
1
0
0
s
1
dbls
1
nil
0
cons
2
sel
2
indx
2
from
1
INNERMOST
./TRS/nontermin/CSR/Ex3_2_Luc97.trs