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I gave my buddy Jor a logic puzzle problem. Same one I give new programmers on interviews. Despite the answer being simple, the problem itself is hard for everyone I ever gave it to. In fact no one has ever been able to solve it within an hour and only one person has ever been able to solve it at all that I personally knew.
Anyway Jor got so frustrated he angrily went to the corner as he worked out the problem.
"If you have 2 coins that make 15 cents and one of them is not a dime..."
(I know, the puzzle you gave Jor sounds a /little/ bit harder than that!)
