The Four-digit Number ABCDMath brain teasers require computations to solve.There is a four-digit number ABCD, where A, B, C, D each represents a different digit from 1 to 9.
If ABCD is divisible by 13, BCDA is divisible by 11, CDAB is divisible by 9, and DABC is divisible by 7, what is the original number ABCD? 
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