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1⋅9 + 2 = 11
12⋅9 + 3 = 111
123⋅9 + 4 = 1111
1234⋅9 + 5 = 11111
12345⋅9 + 6 = 111111
123456⋅9 + 7 = 1111111
1234567⋅9 + 8 = 11111111
12345678⋅9 + 9 = 111111111
123456789⋅9 + 10 = 1111111111
are true.