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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.
I've completed three different Kata today with the exact same results. As well as on one notable occasion reloading the page only to get logged in as another user. My guess is sitewide issues.
Doesn't this return an error if word is zero length?
I'd think best practice would include defending against that.