to structures , it discovered even was by the holes of no group .
(ROOT_0 (S_0 (ATS_3 (ATS_1 (ATS_2 (PP_2 (TO_0 to) (NP_3 (NNS_1 structures))) (COMMA_0 ,)) (NP_0 (PRP_1 it))) (VP_3 (ATVP_1 (VBD_0 discovered) (RB_1 even)) (VP_5 (VBD_2 was) (PP_2 (IN_0 by) (NP_3 (NP_6 (DT_0 the) (NNS_1 holes)) (PP_0 (IN_0 of) (NP_5 (DT_0 no) (NN_2 group)))))))) (DOT_0 .)))