On Fri, Feb 10, 2017 at 6:47 AM, Lindsay John Lawrence <
lawrence.lindsayj...@gmail.com> wrote:

> Apologies for bothering everyone with this. It took some research (there
> is surprising little discussion of the function online or even in most
> books), but I at least understand how it works now.

It would be great if you explain how it works, at least for me since I
cannot understand why 2. returns NIL rather than (A)

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