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2x3:6
3x4:12
4x5:20
5x6:30
6x7:42
9x8:72
2 = 6 6 /2 = 3
3 = 12 12/3 = 4
4 = 20 20/4 = 5
5 = 30 30/5 = 6
6 = 42 42/6 = 7
7 = 56 56/7 = 8
8 = 72 72/8 = 9
9 = 90 90 /9 = 10