(TOP NIL) 
(AGE (TOP)) 
(ANIMAL (TOP)) 
(CAT (ANIMAL)) 
(CATHATER (PERSON)) 
(CATLIKER (TOP)) 
(CATOWNER (CATLIKER PETOWNER)) 
(DOG (ANIMAL)) 
(DOGHATER (PERSON)) 
(DOGOWNER (PETOWNER)) 
(MAN (PERSON)) 
(OLD (AGE)) 
(OLDLADY (CATOWNER DOGHATER WOMAN)) 
(PERSON (TOP)) 
(PETOWNER (PERSON)) 
(WOMAN (PERSON)) 
(YOUNG (AGE)) 
(BOTTOM (CAT CATHATER DOG DOGOWNER MAN OLD OLDLADY YOUNG))