that snow happened for a never sure mounds remains .
(ROOT_0 (S_0 (ATS_3 (NP_1 (DT_1 that) (NN_2 snow)) (VP_4 (VBN_0 happened) (PP_0 (IN_1 for) (NP_2 (ATNP_2 (ATNP_1 (DT_0 a) (ADJP_0 (RB_0 never) (JJ_0 sure))) (NNS_0 mounds)) (NNS_1 remains))))) (DOT_0 .)))