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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.
Unclear how to reproduce. Your code passes when I run it.
Which language? What was the input? Are you sure it is this test you failed?