n<apostrophe>t a lesson was . <apostrophe><apostrophe>
(ROOT_0 (S_0 (ATS_2 (ATS_3 (ATS_1 (RB_1 n<apostrophe>t) (NP_5 (DT_0 a) (NN_2 lesson))) (VP_3 (VBD_0 was))) (DOT_0 .)) (APOSTROPHE_0 <apostrophe><apostrophe>)))