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Source:
wikibot/1-4-plus-1-16-plus-1-64-plus-1-256-plus-⋯
= 1/4 + 1/16 + 1/64 + 1/256 + ⋯ {wiki=1/4_+_1/16_+_1/64_+_1/256_+_⋯}
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