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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.
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No issue.
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The reference solution checks for equality, so I'm pretty sure the tests are sound.
The thing is, most shifts other than the correct shift will not produce words. Therefore if your solution can get most of the words, it will succeed. To me, this is normal behavior.
When I was checking if all the shifted values were in WORDS, I wasn't able to pass all the tests.
However, when I was only checking if most of the words were in WORDS, then I could pass all the tests.
I guess there is something wrong either with some of the random tests or with the WORDS set.