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We have searched the core-jets pairs in the VLBI scales ($<$1 kpc), fromseveral VLBI catalogues, and find out 6 possible binary black hole (BBH)candidates. We present the search result and analyze the candidatespreliminarily, and further study with multi-band VLBI observation and opticalline investigation would be carried out in the future.

A search for binary black hole candidates from the VLBI images of AGNs