Mathematics
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    99*99
    (1000-1)^2
    99*99
    78*89
    9999*9999
    (100-1)^2
    5429*937
    9999^2
    97*96
    999*999
    99*999
    987654*456789
    99999*99999
    999*99
    21111111*55588558585
    123456*2345678
    123456789*987654321
    999*999
    999*999
    99*87

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