1 2, 1 3, 2 3, 1 2, 3 1, 3 2, 1 2, 1 3, 2 3, 2 1, 3 1, 2 3, 1 2, 1 3, 2 3, 
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1 3, 1 2, 3 2, 1 3, 2 1, 2 3, 1 3, 
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0