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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.
It was faster at the beggining (like years ago) but now precesors are stronger and there is no point in doing it. You should not do it because it is easy to make mistakes and it is not clear enought.
I guess it is because array type is double and can't take null so it can't be empty. I may be wrong though.
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