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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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In python, please add instruction about global variable to be used with the function and when the source is got to be None.
One of the validation step checks if source is pointing to a node that has None Data. If those added this would be more clear problem