In on His calculations , <apostrophe><apostrophe>
(ROOT_0 (S_0 (ATS_2 (PP_2 (IN_0 In) (PP_2 (IN_0 on) (NP_3 (PRPDOLLAR_0 His) (NNS_0 calculations)))) (COMMA_0 ,)) (APOSTROPHE_0 <apostrophe><apostrophe>)))