A black perch be up a purple cluster .
(ROOT_0 (S_0 (ATS_3 (NP_1 (ATNP_1 (DT_0 A) (JJ_1 black)) (NN_0 perch)) (VP_4 (ATVP_0 (VB_0 be) (PRT_0 (RP_0 up))) (NP_6 (ATNP_1 (DT_0 a) (JJ_1 purple)) (NN_1 cluster)))) (DOT_0 .)))