a valley could shifted gravel in one .
(ROOT_0 (S_0 (ATS_3 (NP_1 (DT_0 a) (NN_2 valley)) (VP_4 (MD_0 could) (VP_1 (VBN_0 shifted) (ADJP_0 (JJ_1 gravel) (PP_1 (IN_1 in) (NP_2 (NN_3 one))))))) (DOT_0 .)))