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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.
There're some problem with the test case.
QUESTION INTRO:
If a value is present in b, all of its occurrences must be removed from the other:
But in case:
Maybe should update case or question intro.