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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.
In that case a == b, so it's indifferent which of them is returned. In the current case b will be returned, but the condition could be a >= b as well in which case a would be returned when the are equal.