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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.
duplicate issue
Author meant "arbitrarily by me, not you."
"Ties may be broken arbitrarily."
I solved this using javascript and this bit of instruction turned out to be misleading as there is a test case of ("a a c b b") that requires the solution to be ['a','b','c'], not accepting ['b','a','c'].