a back cows in a lesson let Then march one .
(ROOT_0 (S_0 (ATS_3 (NP_1 (NP_6 (ATNP_1 (DT_0 a) (JJ_1 back)) (NNS_1 cows)) (PP_0 (IN_1 in) (NP_5 (DT_0 a) (NN_2 lesson)))) (VP_4 (ATVP_1 (VBD_0 let) (RB_1 Then)) (VP_1 (VB_0 march) (NP_3 (CD_0 one))))) (DOT_0 .)))