boulders always than <apostrophe><apostrophe> , smiled warily so able Maybe .
(ROOT_0 (S_0 (ATS_3 (NP_1 (ATNP_2 (NP_4 (NNS_1 boulders)) (PP_2 (ATPP_0 (ADVP_0 (RB_0 always)) (IN_2 than)) (APOSTROPHE_0 <apostrophe><apostrophe>))) (COMMA_0 ,)) (VP_4 (ATVP_4 (VBD_1 smiled) (ADJP_0 (ATADJP_0 (RB_0 warily) (RB_1 so)) (JJ_1 able))) (ADVP_0 (RB_0 Maybe)))) (DOT_0 .)))