his calculations giggles <apostrophe>s higher .
(ROOT_0 (S_0 (ATS_3 (NP_1 (ATNP_0 (PRPDOLLAR_0 his) (NNS_0 calculations)) (NNS_0 giggles)) (VP_4 (VBZ_0 <apostrophe>s) (ADJP_0 (JJR_0 higher)))) (DOT_0 .)))