a purple lunch discovered up for grass .
(ROOT_0 (S_0 (ATS_3 (NP_1 (ATNP_1 (DT_0 a) (JJ_1 purple)) (NN_0 lunch)) (VP_4 (ATVP_3 (VBD_2 discovered) (PRT_0 (RP_0 up))) (PP_1 (IN_1 for) (NP_0 (NN_2 grass))))) (DOT_0 .)))