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Before UFC on ESPN 51 on Saturday, 12 athletes from the card are scheduled to speak to reporters Thursday at media day.      Related StoriesUFC on ESPN 51 pre-event facts: Cub Swanson hits landmark record in featherweight returnDana White's Contender Series 57: Grading the winnersUFC on ESPN 51 commentary team, broadcast plans set: Kamaru Usman returns as analyst