Parser Trace (failed sentence)
(parse-sentence '(drop the sphere at location 3) :verbose t)
(Seen: (S (TYPE LIFT)) Seeking: ((VP (TYPE LIFT)) (OBJ)))
Input: (DROP THE SPHERE AT LOCATION 3)
(Seen: (VP (TYPE LIFT)) Seeking: ((VERB (ROOT LIFT))))
(Seen: (S (TYPE LIFT)) Seeking: ((VP (TYPE LIFT)) (OBJ)))
Input: (DROP THE SPHERE AT LOCATION 3)
(Seen: (VP (TYPE LIFT)) Seeking: ((VERB-H (ROOT PICK)) (PREP-H (ROOT UP))))
(Seen: (S (TYPE LIFT)) Seeking: ((VP (TYPE LIFT)) (OBJ)))
Input: (DROP THE SPHERE AT LOCATION 3)
(Seen: (S (TYPE DROP)) Seeking: ((VP (TYPE DROP)) (OBJ)))
Input: (DROP THE SPHERE AT LOCATION 3)
(Seen: (VP (TYPE DROP)) Seeking: ((VERB (ROOT DROP))))
(Seen: (S (TYPE DROP)) Seeking: ((VP (TYPE DROP)) (OBJ)))
Input: (DROP THE SPHERE AT LOCATION 3)
(Seen: (VP (TYPE DROP) (1 (VERB (ROOT DROP)))) Seeking: NIL)
(Seen: (S (TYPE DROP)) Seeking: ((VP (TYPE DROP)) (OBJ)))
Input: (THE SPHERE AT LOCATION 3)