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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.
You want to remove everything that is not the "pure" URL? Pretty doable, if you group and remove the initial
/https?:\/\//
, plus the final part after the question mark.