3 7
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18 15
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24 15
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1 2 1 2 1 2 2 2 2 2 2 2 2 2 3 2 3 2 3 2 3 2 3 2 3 2 3 4 2 4 2 4 2 4 2 4 2 4 2 4 2 4 2 4 1 2 3 4