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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 should be clearly stated in the description the input should not be modified. From the current description, several users interpreted that an inline modification of the list was required, or at least possible.