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    OK, As you wish, I rewrite the test method and the random character generation function.

    As an old Kata (I created it 10 months ago, it was my first Kata), I have almost forgotten the meaning of a pair of braces...

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    Only direct opposites may merge, e.g. [North, South] => []. If there's something in between, they may not merge: [North, West, South]. And yes, this has been a common source for confusion in this kata.