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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.
It doesn't have to be too easy, but the clue is non-existent.
I feel this kata should be ranked higher. As a beginner in Python, I know not of a way for a class initializer/constructor to return an array.