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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.
A valid url is "xwww.com" but some implemntations would fail because they replace "www." with nothing rather than looking for "www." at the start.
So I suggest this added as a testcase.