I there on This best idiom <apostrophe>s .
(ROOT_0 (S_0 (ATS_3 (ATS_1 (NP_1 (PRP_0 I)) (ADVP_0 (RB_1 there) (PP_0 (IN_1 on) (NP_6 (ATNP_1 (DT_0 This) (JJS_0 best)) (NN_1 idiom))))) (VP_3 (VBZ_0 <apostrophe>s))) (DOT_0 .)))