Of he stifled over someone not <apostrophe><apostrophe>
(ROOT_0 (S_0 (ATS_2 (SBAR_0 (IN_2 Of) (S_1 (NP_0 (PRP_1 he)) (VP_5 (VBD_0 stifled) (PRT_0 (RP_0 over))))) (ADVP_0 (NP_5 (NN_3 someone)) (RB_1 not))) (APOSTROPHE_0 <apostrophe><apostrophe>)))