flats used every dirt where higher .
(ROOT_0 (S_0 (ATS_3 (NP_1 (NNS_0 flats)) (VP_4 (ATVP_0 (VBN_0 used) (NP_2 (NP_5 (DT_0 every) (NN_2 dirt)) (FRAG_0 (WRB_0 where)))) (NP_6 (JJR_0 higher)))) (DOT_0 .)))