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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.
If you post your code, and mark it "spoiler", others can take a look.
Random tests in Python and Java are aligned, and sufficiently random for such a simple problem IMHO.
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Thank you for an advice. Really it is better to use meaningful names, and to use exceptions :)