8 - 11 year olds

With domino pieces, “walls” can be formed; each wall is made up of two columns; for example, here are two walls:

Two piece wall 6

Four Piece Wall 12

The challenge is: With 12 different pieces of a domino, and without using the double pieces, form the following three walls at the same time:

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A. Wall 16

B. Wall 14

C. Wall 12