on a hard dead <apostrophe>s hat , <apostrophe><apostrophe>
(ROOT_0 (S_0 (ATS_2 (PP_2 (IN_0 on) (NP_3 (NP_4 (ATNP_0 (ATNP_0 (DT_0 a) (ADJP_0 (JJ_0 hard))) (JJ_0 dead)) (POS_0 <apostrophe>s)) (NN_2 hat))) (COMMA_0 ,)) (APOSTROPHE_0 <apostrophe><apostrophe>)))