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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.
I think the kata should be kyu7. The problem is quite simple, but in many languages you need to use proper tools.
It won't pass tests with negative numbers :)
nope it doesn't