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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.
Your code is ciphering something that's not a letter, print the input, the error message format is
Actual should equal Expected
so the input wasn't10l2...