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1 4x 4x 2 16x 4
1 4x 4x 2 16x 4 pictures 5
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1 4x
1 4x 4x 2 16x 4
4x 4 16x 3 3x 2 4x 1 0
16x 4 16x 3 4x 2 4x 1 0
16x 4 4x 2 4x 1 factorise
1 4x 4x 2 16x 4
