required viewing in university computer science departments for years to come 
(ROOT (NP (VBN required) (NP (NP (NN viewing)) (PP (IN in) (NP (NN university) (NML (NN computer) (NN science)) (NNS departments))) (PP (IN for) (NP (NP (NNS years)) (SBAR (S (VP (TO to) (VP (VB come))))))))))
(ROOT (NP (VBN ) (NP (NP (NN )) (PP (IN ) (NP (NN ) (NML (NN ) (NN )) (NNS ))) (PP (IN ) (NP (NP (NNS )) (SBAR (S (VP (TO ) (VP (VB ))))))))))