the answer is 12345654321
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Since there are only five different digits, a 6-digit number can only be generated if a digit can be repeated. If digits can be repeated, the smallest 6-digit number is 111111.
Times
-56xy: it means -1 times 8 times x times 7 times y
x times x times x times x times x times x = x6
2 times 2 times 5 times x times y