But Maybe he studied ahead sure waist-high a group .
(ROOT_0 (S_0 (ATS_3 (ATS_1 (ATS_2 (CC_0 But) (ADVP_0 (RB_0 Maybe))) (NP_0 (PRP_1 he))) (VP_3 (ATVP_2 (VBN_0 studied) (ADVP_0 (RB_0 ahead))) (NP_3 (ATNP_0 (JJ_0 sure) (JJ_1 waist-high)) (NP_5 (DT_0 a) (NN_2 group))))) (DOT_0 .)))