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7 x 2 18 17 x 2 18 17 x 2 18 17 x 2 18 17 x 2 18 17 x 2 18 1
7 x 2 18 17 x 2 18 17 x 2 18 17 x 2 18 17 x 2 18 17 x 2 18 1
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