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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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if this happens, just return an empty list because you can't create proper cascading subsets.
There is nothing to correct, the description is fine, it doesn't say reverse the digits anywhere.
I think this part was the purpose of the kata:
Essentially, rearrange the digits to create the highest possible number.
Is not the same reversing 11411 that return 41111.
Please correct the Kata description.