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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.
The task is not about positive or negative integers at all, but rather about odd and even integers. Negative integers can be as divisible by 2 as positive ones.