a__from
X
cons
mark
X
from
s
X
a__head
cons
X
XS
mark
X
a__2nd
cons
X
XS
a__head
mark
XS
a__take
0
XS
nil
a__take
s
N
cons
X
XS
cons
mark
X
take
N
XS
a__sel
0
cons
X
XS
mark
X
a__sel
s
N
cons
X
XS
a__sel
mark
N
mark
XS
mark
from
X
a__from
mark
X
mark
head
X
a__head
mark
X
mark
2nd
X
a__2nd
mark
X
mark
take
X1
X2
a__take
mark
X1
mark
X2
mark
sel
X1
X2
a__sel
mark
X1
mark
X2
mark
cons
X1
X2
cons
mark
X1
X2
mark
s
X
s
mark
X
mark
0
0
mark
nil
nil
a__from
X
from
X
a__head
X
head
X
a__2nd
X
2nd
X
a__take
X1
X2
take
X1
X2
a__sel
X1
X2
sel
X1
X2
a__from
1
cons
2
mark
1
from
1
s
1
a__head
1
a__2nd
1
a__take
2
0
0
nil
0
take
2
a__sel
2
head
1
2nd
1
sel
2
FULL
./TRS/TRCSR/Ex7_BLR02_GM.trs