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3 groups of 9
9 groups of 3
3x9=25
3x9=27
2x10=26
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10 groups of 2
9 groups of 2
10x2=20
5x4=20
9x2=18
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8x2=24
3 groups of 8
8 groups of 3
8x2=16
8x3=24
7 groups of 9
9 groups of 7
9x7=63