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Using exactly four straight lines, without taking your pen off the (virtual) paper, can you join all nine dots?
A Charming Puzzle – Twentieth Century Standard Puzzle Book, A. Cyril Pearson.
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Answer
Start from the top left dot, and go past the top right dot, and then diagonally down to the bottom left dot, back up to the top left dot, and diagonally down to the bottom right dot.
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