Oh , they narrowed The face-up hike .
(ROOT_0 (S_0 (ATS_3 (ATS_1 (ATS_2 (INTJ_0 (UH_0 Oh)) (COMMA_0 ,)) (NP_0 (PRP_1 they))) (VP_3 (VBD_1 narrowed) (NP_6 (ATNP_1 (DT_1 The) (NN_3 face-up)) (NN_1 hike)))) (DOT_0 .)))