Within option could was really fleas grass .
(ROOT_0 (S_0 (ATS_3 (NP_1 (IN_2 Within) (NN_3 option)) (VP_4 (MD_0 could) (VP_1 (ATVP_0 (VBD_1 was) (ADVP_0 (RB_0 really))) (NP_3 (NP_4 (NNS_1 fleas)) (NN_2 grass))))) (DOT_0 .)))