on their bottle , it had blackened in nap classes .
(ROOT_0 (S_0 (ATS_3 (ATS_1 (ATS_2 (PP_2 (IN_0 on) (NP_3 (PRPDOLLAR_0 their) (NN_0 bottle))) (COMMA_0 ,)) (NP_0 (PRP_1 it))) (VP_3 (VBD_1 had) (VP_2 (VBN_0 blackened) (PP_2 (IN_0 in) (NP_3 (NN_0 nap) (NNS_1 classes)))))) (DOT_0 .)))