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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.
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For SQL, the instructions need to be more clear for a beginner kata. I only managed to pass this by just "assuming" the result only wanted one column after providing 3 and failing the test.
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