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50-2
25-5
5-5
1
49-7
7-7
1
39-3
13-13
1
82-2
41-41
1
250-2
125-5
25-5
5-5
1
49=7•7 {7²}
39=3•13
82=2•41
250=2•5•5•5 {2•5³}