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5/11 * (1/2 * 5/11 + 1/2 * 4/11) + 6/11 * (2/5 * 6/11 + 3/5 * 5/11)
5/11 * (1/2 * 5/11 + 1/2 * 4/11) + 6/11 * (2/5 * 6/11 + 3/5 * 5/11)
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