50: 40 + 10, 30 + 20, 60 - 10, 100 - 50, 70 - 20, 70: 60 + 10, 100 - 30, 70 + 0, 50 + 20, 40 + 30, 100: 100 - 0, 50 + 50, 70 + 30, 80 + 20, 90 + 10,

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