a verbal duel between two gifted performers 
(ROOT (NP (NP (DT a) (JJ verbal) (NN duel)) (PP (IN between) (NP (CD two) (VBN gifted) (NNS performers)))))
(ROOT (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (NP (CD ) (VBN ) (NNS )))))