sel
s
X
cons
Y
Z
sel
X
Z
sel
0
cons
X
Z
X
first
0
Z
nil
first
s
X
cons
Y
Z
cons
Y
first
X
Z
from
X
cons
X
from
s
X
sel1
s
X
cons
Y
Z
sel1
X
Z
sel1
0
cons
X
Z
quote
X
first1
0
Z
nil1
first1
s
X
cons
Y
Z
cons1
quote
Y
first1
X
Z
quote
0
01
quote1
cons
X
Z
cons1
quote
X
quote1
Z
quote1
nil
nil1
quote
s
X
s1
quote
X
quote
sel
X
Z
sel1
X
Z
quote1
first
X
Z
first1
X
Z
unquote
01
0
unquote
s1
X
s
unquote
X
unquote1
nil1
nil
unquote1
cons1
X
Z
fcons
unquote
X
unquote1
Z
fcons
X
Z
cons
X
Z
sel
2
1
2
s
1
1
cons
2
1
0
0
first
2
1
2
nil
0
from
1
1
sel1
2
1
2
quote
1
first1
2
1
2
nil1
0
cons1
2
1
2
01
0
quote1
1
s1
1
1
unquote
1
1
unquote1
1
1
fcons
2
1
2
FULL
./TRS/CSR/Ex6_15_AEL02.trs