add comment about ch. 4, #8

[rforgione]

Comment on the correctness of ch. 4, #8.

[asadoughi]

Hi @rforgione, thanks for your PR. Looking at your changes, I don't see a conclusive answer and I don't have the right answer myself so I've tagged this PR as a 'question' until we can determine the right answer.

[rforgione]

Hey Amir,

Awesome! Thanks for doing that. Also, thanks for maintaining this -- it's
been really helpful in my working through the exercises.

On Fri, Jun 5, 2015 at 8:47 AM, Amir Sadoughi notifications@github.com
wrote:

Hi @rforgione https://github.com/rforgione, thanks for your PR. Looking
at your changes, I don't see a conclusive answer and I don't have the right
answer myself so I've tagged this PR as a 'question' until we can determine
the right answer.

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