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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'm new at javescript, and I didn't think about error handling before. This is good example for me for start to learning about JS.
This is so clever solution, I just create array 2 arrays and check it.