it it refer the group of good knit a grass could crumpled white , a car valley .
(ROOT_0 (S_0 (ATS_3 (NP_1 (NP_0 (PRP_1 it)) (SBAR_0 (S_1 (NP_0 (PRP_1 it)) (VP_5 (VBP_0 refer) (PP_2 (ATPP_0 (ATPP_0 (NP_4 (DT_0 the) (NN_2 group)) (IN_1 of)) (NP_5 (JJ_1 good) (NN_0 knit))) (NP_5 (DT_0 a) (NN_2 grass))))))) (VP_4 (ATVP_0 (VP_5 (MD_0 could) (VP_1 (VBN_0 crumpled) (ADJP_0 (JJ_0 white)))) (COMMA_0 ,)) (NP_6 (ATNP_1 (DT_0 a) (NN_3 car)) (NN_1 valley)))) (DOT_0 .)))