which never reach satisfying conclusions 
(ROOT (SBAR (WHNP (WDT which)) (S (ADVP (RB never)) (VP (VB reach) (NP (JJ satisfying) (NNS conclusions))))))
(ROOT (SBAR (WHNP (WDT )) (S (ADVP (RB )) (VP (VB ) (NP (JJ ) (NNS ))))))