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(ROOT_0 (S_0 (ATS_3 (ATS_1 (ADVP_0 (RB_1 back) (RB_1 n<apostrophe>t)) (NP_0 (PRP_1 he))) (VP_3 (MD_0 might) (VP_1 (ATVP_3 (VBD_1 was) (ADJP_0 (JJ_0 hard))) (S_2 (VP_0 (ATVP_4 (VBZ_0 is) (NP_2 (NN_2 morning) (NN_3 freezing))) (PP_2 (IN_0 Behind) (NP_3 (PRPDOLLAR_0 your) (NNS_0 teeth)))))))) (DOT_0 .)))