They mumbled off to to stand doing the scuffed through the addition the luggage .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 They)) (VP_4 (ATVP_3 (VBD_2 mumbled) (PRT_0 (RP_0 off))) (S_2 (VP_0 (TO_0 to) (VP_1 (TO_0 to) (VP_1 (VB_0 stand) (VP_2 (ATVP_4 (VBG_0 doing) (NP_5 (DT_0 the) (JJ_0 scuffed))) (PP_2 (IN_0 through) (NP_3 (ATNP_0 (DT_0 the) (NN_3 addition)) (NP_5 (DT_0 the) (NN_2 luggage))))))))))) (DOT_0 .)))