They refer by the position coat , Plus <apostrophe><apostrophe>
(ROOT_0 (S_0 (ATS_2 (ATS_0 (S_1 (NP_1 (PRP_0 They)) (VP_5 (VBP_0 refer) (PP_2 (IN_0 by) (NP_6 (ATNP_1 (DT_0 the) (NN_3 position)) (NN_1 coat))))) (COMMA_0 ,)) (CC_0 Plus)) (APOSTROPHE_0 <apostrophe><apostrophe>)))