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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.
An 8kyu kata if ever I saw one.
This kata still has a rounding error problem in Java. Since the buggy test data hasn't been fixed after such a long time, perhaps it would be better for this kata to be removed altogether.