1st number counting by 20s: 20
2nd number counting by 20s: 40
3rd number counting by 20s: 60
4th number counting by 20s: 80
5th number counting by 20s: 100
6th number counting by 20s: 120
7th number counting by 20s: 140
8th number counting by 20s: 160
9th number counting by 20s: 180
10th number counting by 20s: 200
11th number counting by 20s: 220
12th number counting by 20s: 240

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