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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.
I wondered why it was giving me an error without (with: nil), now I realized I didn't need the (). This is one of those things XCode would've auto-completed for me, that are going to make this testing a bit more difficult.