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(ROOT_0 (S_0 (ATS_3 (NP_1 (DT_1 all) (NN_2 grass)) (VP_4 (VBD_0 happened) (SBAR_0 (WHADVP_0 (WRB_0 When)) (S_1 (NP_0 (PRP_1 it)) (VP_5 (VBD_0 thought) (NP_6 (NNP_1 Zone))))))) (DOT_0 .)))