H-10.html#%_chap_7">7</a> by replacing some occurrences of &lt;expression&gt;
with &lt;tail expression&gt;.  Only those rules that contain tail contexts
are shown here.</p>
<p>
<tt>(if&nbsp;&lt;expression&gt;&nbsp;&lt;tail&nbsp;expression&gt;&nbsp;&lt;tail&nbsp;expression&gt;)<br>
(if&nbsp;&lt;expression&gt;&nbsp;&lt;tail&nbsp;expression&gt;)<br>
<br>
(cond&nbsp;&lt;cond&nbsp;clause&gt;<sup>+</sup>)<br>
(cond&nbsp;&lt;cond&nbsp;clause&gt;*&nbsp;(else&nbsp;&lt;tail&nbsp;sequence&gt;))<br>
<br>
(case&nbsp;&lt