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F x 0 4 x 1

F x 0 4 x 1F x 0 4 x 1F x 0 4 x 1F x 0 4 x 1F x 0 4 x 1F x 0 4 x 1
F x 0 4 x 1F x 0 4 x 1F x 0 4 x 1F x 0 4 x 1F x 0 4 x 1F x 0 4 x 1
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