You have eight rods, four of length 11cm, and four of length 12cm.

Fixing these rods together end-to-end only, how can you create a three-dimensional shape that is precisely 7cm high?

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You have eight rods, four of length 11cm, and four of length 12cm.

Fixing these rods together end-to-end only, how can you create a three-dimensional shape that is precisely 7cm high?