A folded prediction is shown written on a slip of paper which is placed in an empty envelope and left in full view. A spectator names a two-digit number, the prediction is removed and the number written matches the named number. every time!

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Marc Oberon's  "37" Magic Trick   A folded prediction is shown written on a slip of paper which is placed in an empty envelope and left in full view. A spectator names a two-digit number, the prediction is removed and the number written matches the named number. every time!