a sharp conference discovered Then grimaced .
(ROOT_0 (S_0 (ATS_3 (NP_1 (ATNP_1 (DT_0 a) (JJ_1 sharp)) (NN_0 conference)) (VP_4 (ATVP_1 (VBD_0 discovered) (RB_1 Then)) (VP_5 (VBD_1 grimaced)))) (DOT_0 .)))