of four grass such the surfers warmed .
(ROOT_0 (S_0 (ATS_3 (ATS_1 (PP_1 (IN_1 of) (NP_2 (CD_0 four) (NN_2 grass))) (NP_5 (ATNP_1 (PDT_0 such) (DT_0 the)) (NNS_1 surfers))) (VP_3 (VBD_0 warmed))) (DOT_0 .)))