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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.
same!
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I'm late to answering your question, but it matters little, because I don't know why I used generators instead of lists. The way I did it just seemed like a good way to me. There wasn't really any "decisions".
It's maybe not a 8 kyu question...