darn n<apostrophe>t back <apostrophe><apostrophe> a lesson did one group .
(ROOT_0 (S_0 (ATS_3 (ATS_1 (ATS_2 (ATS_0 (ADVP_0 (RB_1 darn) (RB_1 n<apostrophe>t)) (ADVP_0 (RB_0 back))) (APOSTROPHE_0 <apostrophe><apostrophe>)) (NP_0 (DT_0 a) (NN_2 lesson))) (VP_3 (VBD_0 did) (NP_3 (CD_0 one) (NN_2 group)))) (DOT_0 .)))