="black">This function leaves the original list unmodified.
Here's how it is used:
</font><pre><font size="4" color="blue">
&gt;&gt;&gt; letters = ['a', 'b', 'c']
&gt;&gt;&gt; rest = tail(letters)
&gt;&gt;&gt; print rest
['b', 'c']
</font></pre><br />
<div align="left"><font color="black"><b>Exercise&nbsp;1</b>&nbsp;&nbsp;<br />
<br />
<em>Write a function called <tt>chop</tt> that takes a list and modifies
it, removing the first and last elements, and returns <tt>None</tt>.<br />
<br />
Then write a functi