Larisa
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Regarding the note about Kosha not being a mafia member, it's not very clear. I don't believe that Kosha is actually a serial killer and is trying to excuse herself in this way. The note doesn't even say that she's innocent. I don't understand why a serial killer would write this note. By the way, am I correct in understanding that no one else could have written notes that night, and this note is specifically from the serial killer?
Твоя очередь говорить, наша - слушать.