over the keys or values in a
table.  We cannot use the same method as iterating over an array because a table
or struct does not contain a known integer range of keys. Instead we rely on a
function <code class="mendoza-code">next</code>, which allows us to visit each of the keys in a struct or
table. Note that iterating over a table will not visit the prototype table.
</p>
<p>As an example, let's iterate over a table of letters to a word that starts with
that letter. We will print out the words to our simpl