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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.
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This kata for python has bugs in test 4 and the penultimate. indicates wrong return values
this solution covers less lines but requires multiple calls to a function (sum), although python is wonderful for providing many functions that make our work easier, sometimes you do not have to abuse them.