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9,18,27,36,45,54
8,16,24,32,40
9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99.
9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99 and on to infinity.
9, 18 and 27 are three numbers that have a GCF of 9