Guess the Date [Win a week of VIP]

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Hey Everyone!
This conversation is becoming Article's first ever mini-game competition. One lucky winner will earn themselves a week of VIP!
Rules are simple; I will give you a question and when you have the answer you will PM directly to Bikini, once the mini-game is over everyone who had sent in the correct answer will be put into a draw for the one week of VIP.
All Questions will be based out of Habbox.com
Let the mini-game begin!
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On what date did Ripieno write about perception?

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Send in your answer directly to Bikini. This mini-game ends in twenty four hours