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Holly Holm's return from a 19-month layoff is official after she and Ketlen Vieira made weight for UFC Fight Night 206.      Related StoriesUFC Fight Night 206 video: Holly Holm, Ketlen Vieira make weight for main event - EnclosureUFC Fight Night 206 official weigh-in results (noon ET)Eryk Anders explains why the 'perfect scenario' would be a smaller cage in a sold-out arena