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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 was receiving the same error but found my way around it. Hope you received help. I realized what was causing the wrong output was the fact that i was using the zero rank in my computations instead of skipping it. Hope this helps anyone who faces the same in the future.