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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.
I will say that it was as very enjoyable challenge, it just needs the bugs worked out.
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I know this is old, but tbf, I prefer to use linq because of ease of use.