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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.
Very nice, thank you! I'd like to fork this for a 3-dimensional version (so the user has to exploit symmetries to not time out).
Observed issue - your s1, s2 are vectors rather than strings, and should be collapsed to strings to match the test cases.