on on a boy , a tree was why over the world .
(ROOT_0 (S_0 (ATS_3 (ATS_1 (ATS_2 (PP_2 (IN_0 on) (PP_2 (IN_0 on) (NP_5 (DT_0 a) (NN_2 boy)))) (COMMA_0 ,)) (NP_0 (DT_0 a) (NN_2 tree))) (VP_3 (VBD_1 was) (VP_2 (VBN_0 why) (PP_0 (IN_1 over) (NP_5 (DT_0 the) (NN_2 world)))))) (DOT_0 .)))