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In my opinion, executing Alex would be better, but I could also support executing Vesper. We shouldn't forget that Ursula is among the Mafia. However, I also note that if this is a clever plan, it seems to have been conceived by the Mafia in the middle of the second day, not at the end (see Larisa's posts), which is a bit early. It's possible, of course, but it's still a bit early.