1st number counting by 15s: 15
2nd number counting by 15s: 30
3rd number counting by 15s: 45
4th number counting by 15s: 60
5th number counting by 15s: 75
6th number counting by 15s: 90
7th number counting by 15s: 105
8th number counting by 15s: 120
9th number counting by 15s: 135
10th number counting by 15s: 150
11th number counting by 15s: 165
12th number counting by 15s: 180

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