that surfer refer on the feathers , and .
(ROOT_0 (S_0 (ATS_3 (ATS_0 (S_1 (NP_1 (DT_1 that) (NN_2 surfer)) (VP_5 (VBP_0 refer) (PP_2 (IN_0 on) (NP_6 (DT_0 the) (NNS_1 feathers))))) (COMMA_0 ,)) (CC_0 and)) (DOT_0 .)))