expanded on 'mapping' concept a bit

generators.html

@@ -233,7 +233,7 @@ def build_match_and_apply_functions(pattern, search, replace):
          for (pattern, search, replace) in patterns]</code></pre>
 <ol>
 <li>Our pluralization rules are now defined as a tuple of tuples of <em>strings</em> (not functions). The first string in each group is the regular expression pattern that you would use in <code>re.search()</code> to see if this rule matches. The second and third strings in each group are the search and replace expressions you would use in <code>re.sub()</code> to actually apply the rule to turn a noun into its plural.
-<li>This line is magic. It takes the sequence of strings in <var>patterns</var> and turns them into a sequence of functions. How? By mapping the strings to the <code>build_match_and_apply_functions()</code> function, which just happens to take three strings as parameters and return a tuple of two functions. This means that <var>rules</var> ends up being functionally equivalent to the previous example: a list of tuples, where each inner tuple is a pair of functions. The first function is the match function that calls <code>re.search()</code>, and the second function is the apply function that calls <code>re.sub()</code>.
+<li>This line is magic. It takes the sequence of strings in <var>patterns</var> and turns them into a sequence of functions. How? By &#8220;mapping&#8221; the strings to the <code>build_match_and_apply_functions()</code> function. That is, it takes each triplet of strings and calls the <code>build_match_and_apply_functions()</code> function with those three strings as arguments. The <code>build_match_and_apply_functions()</code> function returns a tuple of two functions. This means that <var>rules</var> ends up being functionally equivalent to the previous example: a list of tuples, where each inner tuple is a pair of functions. The first function is the match function that calls <code>re.search()</code>, and the second function is the apply function that calls <code>re.sub()</code>.
 </ol>
 
 <p>Rounding out this version of the script is the main entry point, the <code>plural()</code> function.