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(ROOT_0 (S_0 (ATS_2 (TICK_0 ``) (PP_1 (IN_1 of) (NP_2 (ATNP_2 (ATNP_2 (NP_4 (NNS_1 classes)) (PP_2 (ATPP_0 (ADVP_0 (RB_0 here)) (IN_2 if)) (NP_5 (DT_0 a) (NN_2 luggage)))) (COMMA_0 ,)) (SBAR_0 (S_1 (ATS_1 (TICK_0 ``) (NP_1 (PRP_0 They))) (VP_3 (MD_0 can) (VP_1 (TO_0 to) (VP_1 (VB_0 come) (VP_2 (VBG_0 stepping) (ADVP_0 (RB_0 always))))))))))) (APOSTROPHE_0 <apostrophe><apostrophe>)))