through the pitfalls of incoherence and redundancy 
(ROOT (PP (IN through) (NP (NP (DT the) (NNS pitfalls)) (PP (IN of) (NP (NN incoherence) (CC and) (NN redundancy))))))
(ROOT (PP (IN ) (NP (NP (DT ) (NNS )) (PP (IN ) (NP (NN ) (CC ) (NN ))))))