Four Rows of Cans

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Soda cans are placed on their side in a box: four in the bottom row, three in the second row, four in the third row, and three in the top row. This Demonstration shows that it does not matter how you shift the orange cans—the top three always have collinear centers.
Contributed by: Jaime Rangel-Mondragon (August 2011)
Open content licensed under CC BY-NC-SA
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"Four Rows of Cans"
http://demonstrations.wolfram.com/FourRowsOfCans/
Wolfram Demonstrations Project
Published: August 9 2011