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(ROOT_0 (S_0 (ATS_3 (ATS_1 (ATS_2 (ATS_3 (NP_1 (PRP_0 She)) (VP_4 (VBD_0 were) (SBAR_0 (WHADVP_0 (WRB_0 when)) (S_1 (NP_1 (PRP_1 they)) (VP_5 (VBD_2 turned) (S_2 (VP_0 (ATVP_4 (ATVP_3 (ATVP_2 (VB_0 help) (PRT_0 (RP_0 up))) (COMMA_0 ,)) (PP_0 (IN_1 about) (NP_2 (DT_0 this) (NNS_1 boulders)))) (PP_2 (IN_0 before) (NP_3 (NNP_1 Bolivian) (NN_3 gravel)))))))))) (DOT_0 .)) (NP_0 (PRP_1 him))) (VP_3 (VBD_0 did))) (DOT_0 .)))