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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.
Edit: accidental double post due to slow site
Test 5 in the default example tests is indeed correct.
Read the description more carefully.