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Holly Holm and Ketlen Vieira came face-to-face for the first time ahead of UFC Fight Night 206 following weigh-ins.      Related StoriesUFC Fight Night 206 video: Holly Holm, Ketlen Vieira resist breaking off staredown - EnclosureUFC Fight Night 206 video: Holly Holm, Ketlen Vieira make weight for main eventUFC Fight Night 206 video: Holly Holm, Ketlen Vieira make weight for main event - Enclosure