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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.
Thanks for your post but for the future don't post an issue before being sure of your code. Issues are for flaws in the kata, you could simply post a question:-) Posts can be labelled with "Issue" "Question" or "Suggestion".
Please which language? Fixed or random tests? I am pretty sure there are no problem with the tests but it seems that you have extra commas in your results.