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Ring ring! Give the cards a call, they’ll tell you which one is yours!
This smart card can find the card the spectator picked, every time. Incredible!
Thieves! Help Richard figure out the dimensions of the stolen piece.
Turn over, add up and impress!
Red or black? One question is all it takes to wow you!
With a few operations, find the values of the three dice!
Can you put back these 5-square pieces?
Cut squares out of rectangles!
Look at this assortment of beautiful kites!