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(ROOT_0 (S_0 (ATS_3 (ATS_1 (ATS_2 (ATS_0 (ATS_0 (ATS_0 (S_1 (NP_0 (PRP_1 it)) (VP_5 (VBD_1 was) (SBAR_0 (IN_2 if) (S_1 (NP_0 (DT_1 that)) (VP_5 (ATVP_4 (VBG_0 going) (NP_5 (DT_0 the) (NN_2 grass))) (PP_2 (IN_0 in) (NP_3 (NP_5 (DT_0 a) (NN_2 group)) (PP_0 (IN_1 outside) (NP_5 (DT_0 the) (NN_2 valley)))))))))) (COMMA_0 ,)) (COMMA_0 ,)) (COMMA_0 ,)) (APOSTROPHE_0 <apostrophe><apostrophe>)) (NP_0 (PRP_1 it))) (VP_3 (VBD_0 asked) (NP_3 (NN_0 class) (NNS_1 stones)))) (DOT_0 .)))