In a appropriate wall , <apostrophe><apostrophe>
(ROOT_0 (S_0 (ATS_2 (PP_2 (IN_0 In) (NP_6 (ATNP_1 (DT_0 a) (ADJP_0 (JJ_0 appropriate))) (NN_1 wall))) (COMMA_0 ,)) (APOSTROPHE_0 <apostrophe><apostrophe>)))