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Cereal Packets

How can you put five cereal packets together to make different shapes if you must put them face-to-face?

Shaping Up

Stage: 2 Challenge Level: Challenge Level:2 Challenge Level:2

It might help to arrange the cards somehow.
Which shapes don't appear on a card together?
How do you know what all the possible combinations are?
You might want to have a pen and paper handy for jotting things down.