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    Point # 3 doesn't make sense, logically & practically.

    It makes perfect sense, if you don't start making up your own rules. You need to follow the rules of the kata, not what you believe. "distance", as you desribe it, is irrelevant here.

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    What update would you suggest? Because the description tells you MULTIPLE times about this quality to the kata task.

    1. Going to one direction and coming back the opposite direction right away is a needless effort.

    2. You can immediately see that going "NORTH" and immediately "SOUTH" is not reasonable, better stay to the same place!

    3. "NORTH" and "WEST", "WEST" and "SOUTH", "SOUTH" and "EAST" are not directly opposite of each other and can't (be reduced).

    And for that matter very test case we're talking about is literally discussed directly in the Notes section.

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    You misunderstand the task.

    The correct answer to the Fixed Test you showed is {"NORTH","WEST","SOUTH","EAST"}, because there are no consecutive opposite directions to reduce.

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    The "sample tests" block of the "Attempt" contain more assertions than those of the "Test", this is why you pass the latter but not the former.
    Your code throws an error when ending is longer than str.
    Please, do not raise issues to ask for help; a bug in your code is not a kata issue; you can ask questions instead. When you post your code, don't forget to add the spoiler flag and to format with Markdown

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    Sorry, no error in the tests. Kata passed by 85,171 people...