[Rd] not a typo in list.Rd

[Allen S. Rout]

Martin Maechler <maechler at stat.math.ethz.ch> writes:

> I think I'd like to keep fostering a culture where this is known.
> It's such a beatiful useful short concise language element.  If you
> don't know, nowadays there's Wikipedia where you can find it.

or a dictionary.

http://dictionary.reference.com/browse/iff

http://webster.com/dictionary/iff


I'd figure if we can use it in Scrabble(tm), we can use it in
technical documentation.


- Allen S. Rout