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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.
And has nothing to do with coding skills.
WTF? How is this a kata issue?
Basic tests are not the same as full tests, and if you have proof that some test case is incorrect (it isn't), feel free to provide such information when you raise such issue.
Without any information provided, this "issue" is closed.
See if anything in this article may help you: https://docs.codewars.com/training/troubleshooting