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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 could also use Markdown and post your code - but mark it as "spoiler".
Either your code is not fast enough or you have an infinite loop there. That's what that error is about.