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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.
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Only if you don't read the description.
You know hopefully that it needs to take a Integer and decide whether it's even or odd. How do you know if a number is even or odd?
Helps us help you then, the instructions are pretty clear imho, what is it that you don't get?