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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.
How can I take a look a the author's test cases? I come into a problem that in visual studio, the code has no errors, but when I submitted, some test cases failed, but I don't know what's the input of those test cases and make me impossible to debug and find the problem