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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.
Try resubmitting your solution or refresh the browser (seems like you've solved it ^^
Is it possible that your solution crashes, or has an infinite loop?
If not, it's possible it's a kata bug. What language is this? Can you share your code? (see here how: https://docs.codewars.com/training/troubleshooting#post-discourse)