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There's a great way out of this situation: Nefela changes her voice and votes for Hekasan, and Snegovik changes his voice and votes for Hekasan, and then sits down as Mafia. If Snegovik doesn't do that, he'll be Mafia along with Hekasan, but I haven't figured out who the third person is yet; it could be either Neira or Ment.