Start with 12 plastic cups. Use stacks of three, six and three cups to make and dismantle a series of pyramids until you are left again with the original stacks, the 3-6-3 combination.
Sound simple? Try doing it in 14 seconds.
The Speed Stackers Club of Roosevelt Elementary School in Willmar would be happy to demonstrate how it's done.
At this week's club meeting, advisers Larry Hastad and Kim Rosendahl had the Roosevelt gym ready for the group.
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