the valley at the boulders can unmistakably mutter in the lesson .
(ROOT_0 (S_0 (ATS_3 (NP_1 (NP_5 (DT_0 the) (NN_2 valley)) (PP_0 (IN_1 at) (NP_6 (DT_0 the) (NNS_1 boulders)))) (VP_4 (ATVP_1 (MD_0 can) (ADVP_0 (RB_0 unmistakably))) (VP_5 (VBP_0 mutter) (PP_2 (IN_0 in) (NP_5 (DT_0 the) (NN_2 lesson)))))) (DOT_0 .)))