s::= np vp
np::= pn | det adjp n
pn::= Erika | Seattle | Eiffel Tower | Dubs | Patrick Stewart
det::= a | this | the | that
n::= dog | chair | space shuttle | TA | apple | banana
vp::= iv | tv np
iv::= ran | failed | was | flew | existed | shouted
tv::= ate | attacked | protected | acquired | took
adj::= brown | zesty | loud | bright | lucky
adjp::= adj | adj adjp