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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.
Absolutely, it works good for the test cases that you can see, but usually there are some really “nasty” ones in the hidden part, so assumption that all the numbers have only 1 digit and that there are no tests like the one that IhorTimPack mentioned, is pretty strong. But with this assumption the decision is very nice. And thanks the author for this Kata!
you're right