one in which fear and frustration are provoked to intolerable levels 
(ROOT (NP (NP (CD one)) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (NN fear) (CC and) (NN frustration)) (VP (VBP are) (VP (VBN provoked) (PP (IN to) (NP (JJ intolerable) (NNS levels)))))))))
(ROOT (NP (NP (CD )) (SBAR (WHPP (IN ) (WHNP (WDT ))) (S (NP (NN ) (CC ) (NN )) (VP (VBP ) (VP (VBN ) (PP (IN ) (NP (JJ ) (NNS )))))))))