Maybe it mumbled out think down school addition .
(ROOT_0 (S_0 (ATS_3 (ATS_1 (ADVP_0 (RB_0 Maybe)) (NP_0 (PRP_1 it))) (VP_3 (ATVP_3 (VBD_2 mumbled) (PRT_0 (RP_0 out))) (S_2 (VP_0 (ATVP_0 (VB_0 think) (PRT_0 (RP_0 down))) (NP_2 (NN_2 school) (NN_3 addition)))))) (DOT_0 .)))