the low yawn of grass looked for back .
(ROOT_0 (S_0 (ATS_3 (NP_1 (NP_6 (ATNP_1 (DT_0 the) (JJ_1 low)) (NN_1 yawn)) (PP_0 (IN_1 of) (NP_2 (NN_3 grass)))) (VP_4 (VBD_2 looked) (PP_0 (IN_1 for) (NP_2 (RB_1 back))))) (DOT_0 .)))