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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.
Well, you are literally failing the second example of description. It would help if you printed the input to console (add
print(arr)at start). This way you could reason about each failing test case.