P A R S E                                S E N T E N C E   S T A C K

((s))                                        TRTLIAP        ()

((np) (s))                                   TRTLIAP        (S/2)

(((pn toad) np) (s))                          RTLIAP        (S/2)

(((np (pn toad)) s))                          RTLIAP        ()

((vp) ((np (pn toad)) s))                     RTLIAP        (S/3)

(((tv raked) vp) ((np ...)))                   TLIAP        (S/3)

((np) ((tv raked) vp)                          TLIAP        (VP/5 S/3)
 ((np (pn toad)) s))

...                                                         (VP/5 S/3)

(((np (det the) (n leaves)) (tv raked) vp)       IAP        (S/3)
 ((np (pn toad)) s))

...                                                         (VP/5 S/3)

((vp (tv raked) (np (det the) (n leaves))                   (S/3)
     (pp (p into) (np (det a) (n pile))))
 ((np (pn toad)) s))

((s (np (pn toad))                                          ()
    (vp (tv raked) (np (det the) (n leaves))
        (pp (p into) (np (det a) (n pile))))))