FILE - In this Dec. 12, 2015 file photo, Conor McGregor knocks out Jose Aldo during a featherweight championship mixed martial arts bout at UFC 194, in Las Vegas. Aldo wants to re-establish his dominance in the UFC featherweight division 18 months after his stunning loss to McGregor. Top contender Max Holloway will attempt to interrupt Aldo's revival at UFC 212 in Rio de Janeiro on Saturday, June 3, 2017. (AP Photo/John Locher, File)
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