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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.
For one thing, it does not have random tests, which is often automatic downvote for some reviewers.
The kata was auto-retired due to low satisfaction rating. See https://docs.codewars.com/curation/references/approval-retirement-criteria/#auto-retire.