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The guessing part obviously
And btw your obfuscation is wrong it would be !@#$%^# cause same letter === same character
You could do it like OG, and try to draw something, you could do it like Mr. Kornfield and use an equation, you could do it in 1337 however you are free on that, the first hint, all the hints are essential for solving.
BTW, i think i forgott to set the rule that only working days are posting days