higher and higher because the cows , <apostrophe><apostrophe>
(ROOT_0 (S_0 (ATS_2 (PP_2 (ATPP_0 (ADVP_0 (ATADVP_3 (JJR_0 higher) (CC_0 and)) (JJR_0 higher)) (IN_2 because)) (NP_6 (DT_0 the) (NNS_1 cows))) (COMMA_0 ,)) (APOSTROPHE_0 <apostrophe><apostrophe>)))