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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.
Should find a way to better word "negative numbers should be preserved." At first, it seems like it's saying that if the number is negative, then there is no need to reverse the number, which isn't correct.