`` tears discovered api and cluster , the group .
(ROOT_0 (S_0 (ATS_3 (ATS_1 (TICK_0 ``) (NP_1 (NNS_0 tears))) (VP_3 (VBD_0 discovered) (NP_3 (ATNP_0 (NP_6 (ATNP_1 (NN_1 api) (CC_0 and)) (NN_1 cluster)) (COMMA_0 ,)) (NP_5 (DT_0 the) (NN_2 group))))) (DOT_0 .)))