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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.
It's been changed to 6 kyu some time ago.
agreed. It's too easy for a 4 kyu.
Agreed. This is about on par with most 5 kyu kata that I've done.
From what I've seen normally solutions that previously worked are moved to a section called "invalid solutions" but for some reason this kata is not doing it. I suspect it's an issue with codewars itself, and not the specific kata.