Arandor
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It seems you've already figured out the NDKs, so I don't have anything to add.
I won't even comment on the first two notes, and the rest as well, but for a different reason.
And the attempt to "what if it works?!" and frame me as a new mafia member is also funny, although it did coincide well. By the way, the note can help narrow down the circle of suspects; someone like Nebko or Viska could have written it.
Be strong. Believe