If you are on an island with 3 people; a liar, a joker, a truth teller. A liar always lie. A joker can either lie or tell the truth. A truth teller always tell the truth. How many of them can say that they are truth tellers?
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The real truth teller can't help but told the truth of being one while the others can lie and admit to be a truth teller too, either by nature (a knave to lie) or by choice (a Joker who can do both).