terms
N
cons
recip
sqr
N
terms
s
N
sqr
0
0
sqr
s
X
s
add
sqr
X
dbl
X
dbl
0
0
dbl
s
X
s
s
dbl
X
add
0
X
X
add
s
X
Y
s
add
X
Y
first
0
X
nil
first
s
X
cons
Y
Z
cons
Y
first
X
Z
half
0
0
half
s
0
0
half
s
s
X
s
half
X
half
dbl
X
X
terms
1
1
cons
2
1
recip
1
1
sqr
1
1
s
1
1
0
0
add
2
1
2
dbl
1
1
first
2
1
2
nil
0
half
1
1
FULL
./TRS/CSR/ExSec11_1_Luc02a.trs