;(&quot;one&quot; &quot;two&quot; &quot;three&quot; &quot;four&quot; &quot;five&quot; &quot;six&quot;)
            &#039;(&quot;one&quot; &quot;three&quot; &quot;four&quot; &quot;seven&quot; &quot;eight&quot;)
            :test-function &#039;equal)

---  
+++  
@@ -1,6 +1,5 @@
 one
-two
 three
 four
-five
-six
+seven
+eight</code></pre><p>It is also possible to provide filenames:</p>
<pre><code class='lisp'>POFTHEDAY&gt; (difflib:unified-diff
            t
            &#039;(&quot;one&quot; &quot;two&quot;