a cheap thriller , a dumb comedy or 
(ROOT (NP (NP (DT a) (JJ cheap) (NN thriller)) (, ,) (NP (DT a) (JJ dumb) (NN comedy)) (CC or)))
(ROOT (NP (NP (DT ) (JJ ) (NN )) (, ) (NP (DT ) (JJ ) (NN )) (CC )))