20: 2 x 10, 1 x 20, 5 x 4, 20 x 1, 10 x 2, 4 x 5, 15: 1 x 15, 3 x 5, 5 x 3, 15 x 1, 10: 10 x 1, 1 x 10, 2 x 5, 5 x 2, 25: 5 x 5, 1 x 25, 25 x 1, 30: 1 x 30, 30 x 1, 5 x 6, 6 x 5, 2 x 15, 15 x 2, 40: 1 x 40, 40 x 1, 8 x 5, 5 x 8, 10 x 4 , 4 x 10,

How can we make these numbers?

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