accomplish what few sequels can 
(ROOT (S (VP (VB accomplish) (SBAR (WHNP (WP what)) (S (NP (JJ few) (NNS sequels)) (VP (MD can)))))))
(ROOT (S (VP (VB ) (SBAR (WHNP (WP )) (S (NP (JJ ) (NNS )) (VP (MD )))))))