feathers Of <apostrophe><apostrophe> , he heard .
(ROOT_0 (S_0 (ATS_3 (ATS_1 (ATS_2 (PP_2 (ATPP_0 (NP_4 (NNS_1 feathers)) (IN_1 Of)) (APOSTROPHE_0 <apostrophe><apostrophe>)) (COMMA_0 ,)) (NP_0 (PRP_1 he))) (VP_3 (VBD_0 heard))) (DOT_0 .)))