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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.
i tried running your solution and it passed all the tests
Have passed 363 tests but failed 3 ('Austrian Black and Tan Hound', 'Styrian Coarse-haired Hound', 'Combai') which my code is throwing up as "None". I don't have enough info about the dogs dictionary to see why such a specific error is happening.