sentence --> noun_phrase, verb_phrase. noun_phrase --> determiner, noun. noun_phrase --> proper_noun. verb_phrase --> verb_intransitive. verb_phrase --> verb_transitive, noun_phrase. determiner --> [a]. determiner --> [the]. noun --> [whangdoodle]. noun --> [hippogriff]. proper_noun --> [ophelia]. proper_noun --> [rodriguez]. verb_intransitive --> [pirouettes]. verb_transitive --> [chastises].