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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.
it works that way too
This comment is hidden because it contains spoiler information about the solution
What if the string (y) starts with an uppercase letter? It won't work.
I like your solution!
Why difference * 2?