if alpaca was climbing back as <apostrophe><apostrophe> .
(ROOT_0 (S_0 (ATS_3 (NP_1 (IN_2 if) (NN_3 alpaca)) (VP_4 (VBD_1 was) (VP_2 (VBG_0 climbing) (PP_2 (ATPP_0 (ADVP_0 (RB_0 back)) (IN_2 as)) (APOSTROPHE_0 <apostrophe><apostrophe>))))) (DOT_0 .)))