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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.
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From the description I understood the task to be removing adjacent opposite pairs in a loop from the list until none remained to remove. But one of the python tests fails with "['SOUTH', 'WEST', 'WEST'] should equal ['WEST']". That seems to make no sense, because SOUTH and WEST are not opposites!