the muddy friend let out could be to .
(ROOT_0 (S_0 (ATS_3 (NP_1 (ATNP_1 (DT_0 the) (JJ_1 muddy)) (NN_0 friend)) (VP_4 (ATVP_1 (VBD_0 let) (RB_1 out)) (VP_5 (MD_0 could) (VP_1 (VB_0 be) (S_2 (VP_0 (TO_0 to))))))) (DOT_0 .)))