finally they heard used of the ditch .
(ROOT_0 (S_0 (ATS_3 (ATS_1 (ADVP_0 (RB_0 finally)) (NP_0 (PRP_1 they))) (VP_3 (VBD_1 heard) (VP_2 (VBN_0 used) (PP_0 (IN_1 of) (NP_4 (DT_0 the) (NN_2 ditch)))))) (DOT_0 .)))