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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.
Get started now by creating a new collection.
The instructions specifically states assume that array lengths are equal
You are mistaken. There is no such condition on their length been equal. As long as array B has all the powers of array A, it is a valid array.
This solution is 100% correct until someone changes the requirements and test cases.