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(ROOT_0 (S_0 (ATS_3 (ATS_1 (S_2 (VP_0 (VBD_2 left) (VP_2 (VBG_0 going) (PP_2 (TO_0 to) (NP_3 (NN_0 attention) (NNS_1 classes)))))) (NP_0 (PRP_1 you))) (VP_3 (VBD_0 howled))) (DOT_0 .)))