what forced dripping out cows , <apostrophe><apostrophe>
(ROOT_0 (S_0 (ATS_2 (SBAR_0 (WHNP_0 (WP_0 what)) (S_2 (VP_0 (VBD_2 forced) (VP_2 (VBG_0 dripping) (PP_2 (IN_0 out) (NP_3 (NNS_1 cows))))))) (COMMA_0 ,)) (APOSTROPHE_0 <apostrophe><apostrophe>)))