><p>These "opcodes" tell us what to do with subsequences of two lists. For example, <code>REPLACE</code> opcode from the results tell us that:</p>
<pre><code class='lisp'>;; This should be replaced:
POFTHEDAY&gt; (subseq &#039;(:one :two :three :four :five :six)
                   4 6)
(:FIVE :SIX)

;; with:
POFTHEDAY&gt; (subseq &#039;(:one :three :four :seven :eight)
                   3 5)
(:SEVEN :EIGHT)

;; The same as we seen in the text output in the beginning:
--- a.txt 
+++ b.txt 
@@ -1,6 +1,5 @@
 