Ple-Sen
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PleSen - for the deep underground.
As for the night, I think Aziral might be the Mafia. At least, he threatened to kill Arandor (though I also threatened to do so). Overall, Aziral is acting suspiciously, but Happy and "Which" are also voting very quickly. For now:
I think Register is not Mafia.
And seriously, I'm voting for Azi, but with some apprehension.