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9=3*3
12=2*3*2
21=3*7
40=2*2*2*5
35=5*7
36=2*2*3*3
2).
9*12=3*3*3*2*2
21*40=3*7*2*2*2*5
35*36=5*7*2*2*3*3
21^2=3*7*3*7
35^3=5*7*5*7*5*7
40^2*21^2=2*2*2*5*2*2*2*5*3*7*3*7