a back attention was never did bare .
(ROOT_0 (S_0 (ATS_3 (NP_1 (ATNP_1 (DT_0 a) (JJ_1 back)) (NN_0 attention)) (VP_4 (ATVP_1 (VBD_1 was) (ADVP_0 (RB_0 never))) (VP_5 (VBD_0 did) (ADJP_0 (JJ_0 bare))))) (DOT_0 .)))