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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.
Python:
If this version of the kata is not supposed to be solveable by the bruteforce version applicable in the easy kata, then the tests need to be hardened (see my solution, which passed).
It passes roughly 10% of attempts (by stumbling on an optimal solution early, if one exists)