even gravel was overlooking lower and lower , <apostrophe><apostrophe>
(ROOT_0 (S_0 (ATS_2 (SBAR_0 (S_1 (ATS_1 (RB_1 even) (NP_5 (NN_3 gravel))) (VP_3 (VBD_1 was) (VP_2 (VBG_0 overlooking) (ADVP_0 (ATADVP_4 (JJR_0 lower) (CC_0 and)) (JJR_0 lower)))))) (COMMA_0 ,)) (APOSTROPHE_0 <apostrophe><apostrophe>)))