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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 don't understand what we are supposed to return. Do we return the value of the integer that appears an odd number of times? Or do we return the number of times the odd integer appeared? This kata is very unclear.