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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.
It's okay, everything's fine, just take a deep breath, calm down, and tell me once again, calmly: what exactly you think is wrong?
How did you loop different numbers into the array where you added to find the different lengths?