Difference of the greatest and least positive 9 digit number formed by using the digits 1, 2, 3, 4, 5, 6, 7, 8, 9
Repetition of the digits is not allowed
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123456789, 246598137, 345678912, 456789123, 567891234, 678912345, 789123456, 891234567, 912345678.
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