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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.
in my case the error it is because I had a dividend and an equal divisor, so I had to do validation and if they are the same then just add one.