, on literacy stones , and them heard .
(ROOT_0 (S_0 (ATS_3 (ATS_4 (ATS_0 (ATS_0 (COMMA_0 ,) (PP_2 (IN_0 on) (NP_3 (NN_0 literacy) (NNS_1 stones)))) (COMMA_0 ,)) (CC_0 and)) (S_1 (NP_1 (PRP_0 them)) (VP_5 (VBD_1 heard)))) (DOT_0 .)))