without reeking of research library dust 
(ROOT (PP (IN without) (S (VP (NN reeking) (PP (IN of) (NP (NML (NN research) (NN library)) (NN dust)))))))
(ROOT (PP (IN ) (S (VP (NN ) (PP (IN ) (NP (NML (NN ) (NN )) (NN )))))))