the plastic cups are lined up on the table to make a rainbow - colored chain
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4 Engineering Challenges for Kids (Cups, Craft Sticks, and Cubes!) - Frugal Fun For Boys and Girls

Remove the first cup & they start falling in a domino effect: 4 Engineering Challenges for Kids - with Cups, Craft Sticks, and Cubes.
candyclass
The Candy Class
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