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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.
this seems to be a recurring theme in many of these kata as of late; saw numerous issues reported and was afraid I would start working on a solution and encounter a test case with a negative number in it, so decided to check discussions before starting just in case.