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(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 They)) (VP_4 (ATVP_1 (MD_0 <apostrophe>ll) (ADVP_0 (RB_0 back))) (VP_5 (ATVP_4 (VB_0 stop) (PP_1 (IN_1 of) (NP_2 (ATNP_0 (DT_0 the) (VBN_0 listened)) (NP_4 (DT_0 the) (NN_2 group))))) (PP_2 (IN_0 In) (NP_3 (NP_6 (ATNP_1 (DT_0 the) (JJ_1 muffled)) (NN_1 city)) (PP_0 (IN_1 of) (NP_2 (NN_2 cluster) (NN_3 dirt)))))))) (DOT_0 .)))