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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.
See @smile67's answer, it's not an issue of the kata but an issue of your code.
That's not an issue (of this kata), more a personal problem;-). Writing better/more efficient code will fix this "issue":-)...
Just tried and it worked.