( ( ( The interior ) ( of ( the heart ) ) ) ( ( contains ( ( ( four chambers ) and ) ( four valves ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN interior)) (PP (IN of) (NP (DT the) (NN heart)))) (VP (VBZ contains) (NP (NP (CD four) (NNS chambers)) (CC and) (NP (CD four) (NNS valves)))) (. .)))
The interior of the heart contains four chambers and four valves.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD four) (NNS valves)) (PP (IN in) (NP (DT the) (NN heart))))) (. .)))