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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.
Yeah, sorry about that. I was working more in the problem and realized I was mistaken.
Explain properly edge cases
Using the variable cards as the array of cards gives an error, got 13 instead 52. Should explain that the cards variable should be reserverd or something like that.