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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.
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kata hint != kata suggestion
if you use a iteration to comprobe if b include element from a is better to do the iteration in descending order to dont have error