ore keywords that provide the bounds
and step size of the iteration.  The <code>&amp;sequence</code> lambda-list
keyword is a shorthand for these sequence keywords.  They are:
<code>from</code>, <code>upfrom</code>, <code>downfrom</code>, <code>to</code>, <code>downto</code>,
<code>above</code>, <code>below</code> and <code>by</code>.  <code>from</code> provides the
starting value for <var>var</var> and defaults to zero.  <code>to</code> provides
a final value and implies that the successive values of <var>