The Mysterious Box
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There is a box that is locked with a combination lock. The lock has four dials, each with digits from 0 to 9. The combination follows these rules:
The sum of all digits is 15.
The first digit is greater than the second digit.
The third digit is twice the fourth digit.
What could be the combination? 
Multiple solutions are possible, such as:
2184
4263
5163
5442
6342
7242
7521
8421
9321
Your Answer
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