r></nobr> (default is <code>nil</code>, meaning
end of <nobr><var>sequence</var></nobr>)
</td></tr><tr valign="top"><td valign="baseline" nowrap><i>count</i></td><td valign="baseline">&nbsp;&nbsp;&nbsp;&nbsp;</td><td valign="baseline"> An integer or <code>nil</code> (default is <code>nil</code>)
</td></tr><tr valign="top"><td valign="baseline" nowrap><i>key</i></td><td valign="baseline">&nbsp;&nbsp;&nbsp;&nbsp;</td><td valign="baseline"> A <a href="ref-glossary.html#id80">function&nbsp;designator</a> specif