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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 might be worth metioning in the description that the returned numbers need to be formatted in your local culture - your instructions seem very clear that you want numbers of the form "2,5", but the solution only worked for me (UK) as "2.5".