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Amazon.com: Speed Cube Set, Puzzle Cube,9 Pack Magic Cubes Pyraminx Pyramid + 2x2 + 3x3 + 4x4 + Megaminx + Mirror + Mini 3x3 + Skewb + Fenghuolun Puzzle Cube Toy for Kids & Adults : Toys & Games
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Overview of Rubik's Cube and Reflections on Its Application in Mechanism | Chinese Journal of Mechanical Engineering | Full Text
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