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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.
{"NORTH", "SOUTH", "SOUTH", "EAST", "WEST", "NORTH", "WEST"}
According to the instructions, NORTH followed immediately by SOUTH cancels out, and vice versa. Same case for WEST and EAST.
Thus the nett result is SOUTH, NORTH, WEST.
Then why is the result expected just WEST?
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ooh.. i get it. it plays by tetris logic.