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    I'm going to say the same thing others have said...
    I don't think it makes sense to disallow the use of alias_method if they aren't creating a unique method. This asks users to create an alias for a method while preventing them from using best practices. For newer programmers this could potentially teach them bad practices or confuse them on what the best practices are.

    I recommend allowing the use of alias_method if the goal is to have users alias a method, or have them add a simple method like String#first or String#last to return the first or last character.

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

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    How are you getting an expected result of -3 from this?
    The result should be -3.66666666... which this solution does evaluate to correctly.

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    I keep getting a Timeout Error after passing the first five tests.
    Any chance of setting the timeout to be longer?

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    On the profile page, the "Load More Items" button on the bottom of the page does not work. It appears that the partial is missing.