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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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I'm curious what the result should be when both array1 and array2 are null, nil, none, etc.?
I put an explicit check for that in my solution and tried with both a true and false result. It passed all tests each time, so I guess that case isn't being tested?