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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.
all the directions occur only once, and so it cant be reduced
['NORTH', 'SOUTH', 'WEST', 'NORTH'] can be reduced to ['WEST', 'NORTH'] since
northandsouthare cardinally opposite directionsThis comment is hidden because it contains spoiler information about the solution