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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.
This is quite a lazy answer for top-rated. The comments below mention it will accept numbers etc, which I think isn't even that bad compared to the fact it will accept spaces and slashes, etc.
Will this remove trailing spaces on line without markers?