9 dots 4 lines | 9 dots 1 line | This tricky puzzle & the awesome riddle has three genius solutions - YouTube | Riddles, Dots, Lines
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Nine dots puzzle - Wikipedia
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The 9 dot puzzle
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Frontiers | The Role of Motor Activity in Insight Problem Solving (the Case of the Nine-Dot Problem)
Math Riddle Genius Test: Can you join all 9 dots with 4 lines in this viral puzzle?
History of the Nine Dot Problem - Art of Play
recreational mathematics - How to prove the number of solutions to nine dots puzzle - Mathematics Stack Exchange
History of the Nine Dot Problem - Art of Play
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