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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.
While I was trying to solve this I kept getting Expected 4, got 3. or expected 8 instead of 7 etc. The test case failure message reverses the expected number of runs and the actual number of runs.
Probably because most people at 7kyu aren't very familiar with regex yet