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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.
Nice, but it doesn't account for incorrent data input (i.e. someone accidentally enters a negaitve integer
This would need input validation in produciton as entering a negative integer produces incorrect results. For example, entering -1 pillars returns -4000