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1/2 - (1/2)^5 /5 +(1/2)^9 /9 -(1/2)^13/13 +(1/2)^17/17
1/2 - (1/2)^5 /5 +(1/2)^9 /9 -(1/2)^13/13 +(1/2)^17/17
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