( ( P ( Wave ( A ( P Wave ) ) ) ) ( ( is ( one ( of ( ( two types ) ( of ( body waves ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP P) (NNP Wave) (NNP A) (NNP P) (NNP Wave)) (VP (VBZ is) (NP (NP (CD one)) (PP (IN of) (NP (NP (CD two) (NNS types)) (PP (IN of) (NP (NN body) (NNS waves))))))) (. .)))
P Wave A P Wave is one of two types of body waves.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD two) (NNS types)) (PP (IN of) (NP (NN surface) (NNS waves))))) (. .)))