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On Fri, Aug 26, 2011 at 1:09 PM, Axel Kittenberger <> wrote:
> It says if the value at the given acceptable index .. returns bla.
> OTHERWISE returns null.

And it's exactly here that you (and liam) get the sentence wrong.
Repeating Josh:

"If the value at the given acceptable index" explicitly implies that
you've given an acceptable index to the function. Reading into the
rest of the sentence serves no purpose because you have not met this