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The Puzzle of Separating X from O

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The puzzle of separating X from O

We have the next square with four columns and four lines drawn on a square of paper that includes all of the paper. Each square contains a X sign or O sign as shown in the figure.

What is required is to do one straight line cut in order to separate the X and O signs from each other as they will become separate as shown in the figure below. (The secret lies in the way the paper is folded before cutting).

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