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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.
Nonsensical last example is so wrong and needs to be fixed. Original idea of the kata is great though.
I don't think you should use "string" as variable name, since string is built-in Pythin module