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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.
Thank you sir, but i haven't noticed it yet before i write my kata, even no similar kata relates to "UPC" after I submit it. All I want is to bring some real world problems for people to solve, even a single digit difference could be divided into different business domains.
thanks for your advice, random test added
yep, EAN and UPC are similar