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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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I don't know that it is best practice, but in essence it is the same as what you submitted. The linq solution is more succinct and readable at glance versus trying to disect the logic in the for loop.