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Robin and Barney try to keep the truth about their one night stand from Kevin and Nora, but in the end decide to tell the truth and meet back at the bar to talk about their relationship. Barney goes through with it, but Robin ends up showing with Kevin by her side and a dejected Barney goes home alone. Marshall, Lily and Ted go to a concert together and a potent bag of "sandwiches" causes the guys to lose time.