so that was later remains the classes .
(ROOT_0 (S_0 (ATS_3 (ATS_1 (ADVP_0 (RB_0 so)) (NP_0 (DT_1 that))) (VP_3 (ATVP_1 (VBD_1 was) (RB_1 later)) (VP_5 (VBZ_0 remains) (NP_2 (DT_0 the) (NNS_1 classes))))) (DOT_0 .)))