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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.
Thanks, the actual author reference solution was wrong, but it passed the fixed cases. It was updated.
Can confirm - the reference solution doesn't check that the
stackis empty before returning.