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1..9 = 45
1..99 = SumOfTensDigits + SumOfOnesDigits
    = 10*1..9 + 10*1..9 = 900
...
    = 4.5*$n*10^$n
1..1e6 = 1..'9'x6 + 1 = 4.5*6*10^6 + 1 = 27e6 + 1
    = 27_000_001