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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 want to express my small frustration with this kata, because it's not clear whether the expression must be evaluated on each call, or if it has to be calculated at the ending method call. And as it turned out, the first variant is the correct one.