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(ROOT_0 (S_0 (ATS_3 (ATS_1 (ADVP_0 (RB_1 back) (NP_4 (ATNP_0 (DT_0 the) (VBN_0 why)) (POS_0 <apostrophe>s))) (NP_0 (NNP_0 Today))) (VP_3 (VBD_0 warmed))) (DOT_0 .)))