What do you think about this?



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    18=9
    27=9
    36=9
    45=9
    54=9
    63=9
    72=9
    81=9
    181=10
    272=11
    363=12
    454=13
    545=14
    636=15
    727=16
    818=17
    1818=18
    2727=18
    3636=18
    4545=18
    5454=18
    6363=18
    7272=18
    8181=18


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