in Bolivians boulders , they heard higher .
(ROOT_0 (S_0 (ATS_3 (ATS_1 (ATS_2 (PP_2 (IN_0 in) (NP_3 (NNP_1 Bolivians) (NNS_1 boulders))) (COMMA_0 ,)) (NP_0 (PRP_1 they))) (VP_3 (VBD_1 heard) (ADJP_0 (JJR_0 higher)))) (DOT_0 .)))