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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.
good catch, thank you.
You could have done the list and set in the same line, and also on the last part you could have just do the statement (len(string) == len(arr)), this will return true if true, if not then it will be false.