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    {"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?

    ...

    ooh.. i get it. it plays by tetris logic.