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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 also got that error at first, but now I know why. Maybe adding something about not using length in the description? Or is that clear enough with the "should work with infinite lists"? I know I missed/misunderstood that, but if it's only me then the problem is with me and not the description.