The Quechua knew to make this ditch of boulders doing just .
(ROOT_0 (S_0 (ATS_3 (NP_1 (DT_1 The) (NNP_1 Quechua)) (VP_4 (VBD_2 knew) (S_2 (VP_0 (TO_0 to) (VP_1 (VB_0 make) (NP_3 (NP_5 (DT_0 this) (NN_2 ditch)) (PP_0 (IN_1 of) (NP_2 (NP_4 (NNS_1 boulders)) (VP_2 (VBG_0 doing) (ADVP_0 (RB_0 just))))))))))) (DOT_0 .)))