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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.
Uhh, I'm not sure. Don't focus on the first number. You could count how many even and odd numbers there are, and go from there.
Maybe you misunderstood the task. The parity shouldn't be based on just the first element, it could be any element (or all of them really).