( ( i ( Wave ( Upon Wave ) ) ) ( graphically ( ( illustrates ( ( the interference ) ( between ( two waves ) ) ) ) . ) ) )
(ROOT (S (NP (NNP i) (NNP Wave) (NNP Upon) (NNP Wave)) (ADVP (RB graphically)) (VP (VBZ illustrates) (NP (NP (DT the) (NN interference)) (PP (IN between) (NP (CD two) (NNS waves))))) (. .)))
i Wave Upon Wave graphically illustrates the interference between two waves.
(ROOT (S (NP (JJ Constructive) (NN interference)) (VP (VBZ is) (SBAR (WHADVP (WRB when)) (S (NP (CD two) (NNS waves)) (VP (VBP combine) (S (VP (TO to) (VP (VB create) (NP (DT a) (JJR larger) (NN wave))))))))) (. .)))