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25 I 5
5 I 5
1
50=2*5*5
70 I 2
35 I 5
7 I 7
1
70=2*5*7
60 I 2
30 I 2
15 I 3
5 I 5
1
60=2*2*3*5
42 I 2
21 I 3
7 I 7
1
42=2*3*7
70=5*2*7=70
60=2*2*3*5=60
42=3*2*7=42