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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 for this request. Descrition is rewritten without the Java specific terms.
Thank you for pointing out this issue. I completely agree. Change is made in the Kata description and in the code too.
Thanks again. I am going to use non-negative instead of positive or null.
Thank you for reporting the issue. Correction is made in the Kata description.