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99 = 100 - 1
999 = 1000 - 1
9999 = 10000 - 1
99999 = 100000 - 1
999999 = 1000000 - 1
9999999 = 10000000 - 1
99999999 = 100000000 - 1
999999999 = 1000000000 - 1
---------------------------- +
= 1111111111 - 9
= 1111111102