in think back navy , <apostrophe><apostrophe>
(ROOT_0 (S_0 (ATS_2 (PP_2 (IN_0 in) (SBAR_0 (VP_0 (ATVP_0 (VB_0 think) (PRT_0 (RP_0 back))) (NP_2 (NN_3 navy))))) (COMMA_0 ,)) (APOSTROPHE_0 <apostrophe><apostrophe>)))