Hearst left to try good of only boulders . knees left .
(ROOT_0 (S_0 (ATS_3 (ATS_1 (ATS_2 (ATS_3 (NP_1 (NNP_0 Hearst)) (VP_4 (VBD_2 left) (S_2 (VP_0 (TO_0 to) (VP_1 (VB_0 try) (ADJP_0 (JJ_1 good) (PP_1 (IN_1 of) (NP_2 (JJ_1 only) (NNS_1 boulders))))))))) (DOT_0 .)) (NP_0 (NNS_0 knees))) (VP_3 (VBD_0 left))) (DOT_0 .)))