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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.
My solution doesn't pass sometimes on the last randomized test case, and it seems to be due to inconsistency with how the case of two items having the same priority is handled. It seems to be a toss-up for which one is shipped first.
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