( three ( ( chambered ( heart 6 ) ) . ) )
(ROOT (S (NP (CD three)) (VP (VBD chambered) (NP (NN heart) (CD 6))) (. .)))
three chambered heart 6.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD three) (NNS chambers)) (PP (IN in) (NP (DT an) (NN amphibian) (NN heart))))) (. .)))