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(ROOT_0 (S_0 (ATS_3 (NP_1 (DT_1 The) (NN_2 boy)) (VP_4 (ATVP_1 (VBZ_0 <apostrophe>s) (PRT_0 (RP_0 up))) (VP_1 (ATVP_3 (ATVP_2 (ATVP_0 (VP_5 (MD_0 would) (VP_1 (ATVP_3 (ATVP_4 (VB_0 let) (PP_1 (IN_1 in) (NP_2 (ATNP_0 (NP_0 (PRP_1 you)) (COMMA_0 ,)) (NP_4 (DT_0 a) (NN_2 addition))))) (PP_1 (IN_1 on))) (S_2 (VP_0 (TO_0 to))))) (COMMA_0 ,)) (PP_1 (IN_1 of) (NP_2 (ATNP_0 (DT_0 the) (NN_3 class)) (NP_4 (NNS_1 stones))))) (COMMA_0 ,)) (PP_0 (IN_1 of) (NP_6 (RB_1 out) (JJR_0 higher)))))) (DOT_0 .)))