corn , classes were n<apostrophe>t know the black valley for alpaca .
(ROOT_0 (S_0 (ATS_3 (NP_1 (ATNP_0 (NP_5 (NN_3 corn)) (COMMA_0 ,)) (NNS_0 classes)) (VP_4 (ATVP_1 (VBD_1 were) (RB_1 n<apostrophe>t)) (VP_5 (VB_0 know) (NP_3 (NP_6 (ATNP_1 (DT_0 the) (JJ_1 black)) (NN_1 valley)) (PP_0 (IN_1 for) (NP_5 (NN_3 alpaca))))))) (DOT_0 .)))