Her best perch arm was n<apostrophe>t was . <apostrophe><apostrophe>
(ROOT_0 (S_0 (ATS_2 (ATS_3 (NP_1 (ATNP_1 (ATNP_0 (PRPDOLLAR_0 Her) (JJS_0 best)) (NN_0 perch)) (NN_0 arm)) (VP_4 (ATVP_1 (VBD_1 was) (RB_1 n<apostrophe>t)) (VP_5 (VBD_1 was)))) (DOT_0 .)) (APOSTROPHE_0 <apostrophe><apostrophe>)))