[advising] PL inside KE-EK

henry (03/17/83)

In format, changing the page length (.PL) inside a keep (.KE-.EK)
can really mess things up.  It can make nroff croak with a very
uninformative message, or do other unkind things like silently
producing no output whatsoever.  This combination cropped up in
an attempt to squeeze a bit more text onto a page (so that a small
change could be incorporated without messing up later pagination).