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[(666.....0" digits ")^(2)+(888.....)" d...

[(666.....0" digits ")^(2)+(888.....)" digits ")=],[[(4)/(9)(10^(n)-1)],[,(4)/(9)(10^(2n)-1)],[,(4)/(9)(10^(n)-1)^(2)],[,(8)/(9)(10^(n)-1)]],[" 9."]

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