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sum[n=0, infty] (1/(6n+1) + 1/(6n+3) + 1/(6n+5) - 1/(4n+2) - 1/(4n+4))
sum[n=0, infty] (1/(6n+1) + 1/(6n+3) + 1/(6n+5) - 1/(4n+2) - 1/(4n+4))
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