http://demonstrations.wolfram.com/TheTroublesomeTwelveCircleProblem/
The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily.
Move all the white disks onto the orange disk so that none of the white disks overlap. This puzzle, named Twubblesome Twelve, has several unintended solutions.
Contributed by: Bill Gosper
Based on a program by: Ed Pegg Jr
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