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)
