Each step is nine less.
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18, 27, 36, 45, 54, 63.
9, 18, 27, 36, 45, 54, 63, 72
15, 30, 45, 60, 75, 90... 9, 18, 27, 36, 45, 54, 63...
9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99 . . .
the next multiple of 9 is 18, 27, 36, 45, 54, 63, 72, 81.....