( ( Types ( of machine ) ) . )
(ROOT (NP (NP (NNS Types)) (PP (IN of) (NP (NN machine))) (. .)))
Types of machine.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD six) (NNS types) (NNS types)) (PP (IN of) (NP (JJ simple) (NNS machines))))) (. .)))