They might come missing did by snow alpaca .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 They)) (VP_4 (MD_0 might) (VP_1 (VB_0 come) (ADJP_0 (JJ_0 missing) (S_2 (VP_0 (VBD_0 did) (PP_1 (IN_1 by) (NP_2 (NN_2 snow) (NN_3 alpaca))))))))) (DOT_0 .)))