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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.
Read other people's solution and apply coding best practices , also not a kata suggestion ^^
Ranks can't be changed especially for old kata like this one
19,101 people solved it.
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An issue is a bug in the kata, not a problem with your code. Please read carefully the description. And if you still don't get it, this Discourse page is full of people asking the same.