n/a
dog
collie
animal
dog
collie
animal
canine
collie
animal
canine
collie
poodle
colliecanine
collie
collie
collie
#S(b a 1 b 2 c 3)
#S(d a nil b -2 c 3)
(10 20 300 42 42)
(10 -20 300 42 0)