The next construction we're going to look at
is one for putting things above and below other
things, in a rather specialized way.
For example, if you want something like
The words "from" and "to" are more magic, like
sub or sup or over. The "from" part is centered
under the main piece; the "to" part is centered
As a warmup, modify "Example" so it produces
output that looks like the following, then type
Let $Q( pi )$ be $sum from {i= pi sub 1} to {i= pi sub 2} x sub i$.
#once neqn Ref | nroff >X1 &
#once neqn message Ref | nroff -T$term %s/tinyms -