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6* (sum(n, 0, 400) 0.5n) - (sum(n, 0, 100) 0.5n) - (sum(n, 0, 100) 0.5n) - (sum(n, 0, 100) 0.5n) - (sum(n, 0, 100) 0.5n) - (sum(n, 0, 100) 0.5n) - (sum(n, 0, 100) 0.5n)
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