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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 are no random tests.
There's already a kata that does 95% of the job (evaluating the highest possible hand for a player).
The remaining is just computing a total order and comparing this score, which is a trivial addition compared to the task. So I'm tempted to call this a duplicate.