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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.
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.