1st number counting by 3s: 3
2nd number counting by 3s: 6
3rd number counting by 3s: 9
4th number counting by 3s: 12
5th number counting by 3s: 15
6th number counting by 3s: 18
7th number counting by 3s: 21
8th number counting by 3s: 24
9th number counting by 3s: 27
10th number counting by 3s: 30
11th number counting by 3s: 33
12th number counting by 3s: 36

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