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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.
Ranks can't be changed, the author doesn't decide the rank, and not a suggestion.
For each language:
Definitely not 4kyu in my opinion but ranking it as 5kyu would be more than fair.
By the way, this was one of the hardest 6kyu Katas I have ever solved. I had to constantly
console.log
different stages of my code to verify what was actually going on as I coded my algorithm.