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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.
Thank you! Oh, and btw thank you for this great kata!
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Instead of trying to disable the builtin features why don't you implement your own list like data type that supports only the allowed functions?