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    I took this as asking for a single string, which is what that is.

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    See the post above.
    I am sure the tests are 100% correct.

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    The Common Lisp example return data is incorrect.

    "(CORWILL, ALFRED)(CORWILL, FRED)(CORWILL, RAPHAEL)(CORWILL, WILFRED)(TORNBULL, BARNEY)(TORNBULL, BETTY)(TORNBULL, BJON)"
    

    Lists in Lisp do not have commas and the description of the problem does not mention the need to add commas. This is confusing.

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    This comment is hidden because it contains spoiler information about the solution