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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 found this solution good, but when we multiply [None]*len(keys) it will produce redundant "len(keys) - len(values)" objects in values list. What if keys length = 10000 and values length = 2?