0
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[[0, 0], [0, 1], [0, 2], [0, 3]]
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[[0, 5], [0, 6], [0, 7], [0, 8]]
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[[0, 10], [0, 11], [0, 12], [0, 13]]
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[[0, 14], [0, 15], [0, 16], [0, 17]]