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I've read your arguments, and you know what? I'd rather vote for Hekasan's execution. All these Ilannas, and I'm not 100% sure about Kostyak. Yes, I remember the logic about killing Demerol, and yes, his activity is quite noticeable. However, I've had other thoughts. Regarding the first argument: if Kostyak is Mafia, is his opinion in the Mafia conference so important that he has the final say on executions? As for the second argument... If Kostyak is Town, he might not have even sent the Night Action. Although the newspaper came out a bit early, who knows... Or maybe he came to his senses and sent the Night Action at the end of the previous day or when he was on the forum?
Considering his possible Ilanna role, things could get bad. And the argument from Shaman (or whoever said that) about "tie some evidence of Ilanna to him, then maybe he's Ilanna" is so epic that it's alarming. "Check if you're sinking, then maybe you're drowning."
If the majority of votes are for Kostyak, I'll join in. But it's better to execute Hek. He's definitely Mafia and definitely not Ilanna.