diff --git a/web/index_for_pdf_print.html b/web/index_for_pdf_print.html
index d763039..a5cd590 100644
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+++ b/web/index_for_pdf_print.html
@@ -1,6 +1,7 @@
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+
 <div class="pagebreak"></div>
 <h2 id="index"><a href="#index" name="index">#</a>Index</h2>
 
@@ -16,7 +17,7 @@
 <strong>audio, 40-41</strong>  </p>
 <h3 id="b">B</h3>
 <p><strong>basic script template, 42</strong><br>
-<strong>beautifulsoup4 library, 35</strong><br>
+<strong>beautifulsoup library, 35</strong><br>
 <strong>binary representation, 8</strong><br>
 <strong>bitwise operators, 8</strong><br>
 <strong>bottle library, 36</strong><br>
@@ -25,10 +26,9 @@
 <p><strong>cache, 13</strong><br>
 <strong>csv module, 26, 34</strong><br>
 <strong>callable, 17</strong><br>
-<strong>chars, 5</strong><br>
-<strong>class, 14-15</strong><br>
+<strong>class, 4, 14-19, 31-32</strong><br>
 <strong>closure, 12</strong><br>
-<strong>collection, 18</strong><br>
+<strong>collection, 4, 18</strong><br>
 <strong>collections module, 2, 3, 4, 19, 29</strong><br>
 <strong>combinatorics, 8</strong><br>
 <strong>command line arguments, 22</strong><br>
@@ -44,7 +44,7 @@
 <strong>datetime module, 8-9</strong><br>
 <strong>decorator, 13</strong><br>
 <strong>deques, 29</strong><br>
-<strong>dictionaries, 2</strong><br>
+<strong>dictionaries, 2, 11</strong><br>
 <strong>duck types, 16-19</strong>  </p>
 <h3 id="e">E</h3>
 <p><strong>enum module, 19-20</strong><br>
@@ -55,14 +55,14 @@
 <p><strong>files, 23</strong><br>
 <strong>filter function, 11</strong><br>
 <strong>floats, 4, 6, 7</strong><br>
-<strong>format function, 6-7</strong><br>
+<strong>format, 6-7</strong><br>
 <strong>functools module, 11, 12, 13, 16</strong><br>
 <strong>futures, 30</strong>  </p>
 <h3 id="g">G</h3>
-<p><strong>generator, 4</strong><br>
+<p><strong>generators, 4, 11</strong><br>
 <strong>global keyword, 12</strong></p>
 <h3 id="h">H</h3>
-<p><strong>hash function, 16</strong><br>
+<p><strong>hashable, 16</strong><br>
 <strong>hexadecimal representation, 8</strong>  </p>
 <h3 id="i">I</h3>
 <p><strong>image, 39</strong><br>
@@ -71,7 +71,7 @@
 <strong>introspection, 31</strong><br>
 <strong>ints, 4, 7, 8</strong><br>
 <strong>is operator, 16</strong><br>
-<strong>iterable, 18</strong><br>
+<strong>iterable, 4, 18</strong><br>
 <strong>iterator, 3, 17</strong><br>
 <strong>itertools module, 3, 8</strong>  </p>
 <h3 id="j">J</h3>
@@ -79,7 +79,7 @@
 <h3 id="l">L</h3>
 <p><strong>lambda, 11</strong><br>
 <strong>list comprehension, 11</strong><br>
-<strong>lists, 1-2</strong><br>
+<strong>lists, 1-2</strong>, 11<br>
 <strong>locks, 29</strong><br>
 <strong>logging, 35</strong>  </p>
 <h3 id="m">M</h3>
@@ -95,14 +95,14 @@
 <strong>nonlocal keyword, 12</strong><br>
 <strong>numpy module, 37-38</strong>  </p>
 <h3 id="o">O</h3>
-<p><strong>octal representation, 24</strong><br>
-<strong>open function, 22-23</strong><br>
-<strong>operator module, 31</strong><br>
+<p><strong>open function, 22-23</strong><br>
+<strong>operator module, 12, 31</strong><br>
 <strong>OS commands, 24-25</strong><br>
 <strong>os module, 23, 24-25</strong>  </p>
 <h3 id="p">P</h3>
-<p><strong>partial function, 12</strong><br>
-<strong>paths, 23-24</strong><br>
+<p><strong>pass keyword, 14, 34, 42</strong><br>
+<strong>partial function, 12, 20</strong><br>
+<strong>path, 23-24</strong><br>
 <strong>pickle module, 25</strong><br>
 <strong>pillow library, 39</strong><br>
 <strong>plotting, 34</strong><br>
@@ -120,18 +120,19 @@
 <strong>regular expressions, 5-6</strong><br>
 <strong>requests library, 35, 36</strong>  </p>
 <h3 id="s">S</h3>
-<p><strong>sqlite3 module, 27</strong><br>
+<p><strong>sqlite module, 27</strong><br>
 <strong>scraping, 35</strong><br>
-<strong>sequence, 18, 19</strong><br>
-<strong>sets, 2</strong><br>
+<strong>sequence, 4, 18, 19</strong><br>
+<strong>sets, 2, 11</strong><br>
 <strong>shell commands, 25</strong><br>
 <strong>sleep function, 34</strong><br>
 <strong>slots attribute, 15</strong><br>
-<strong>sort function, 1, 16</strong><br>
+<strong>sortable, 1, 16</strong><br>
 <strong>splat operator, 10-11</strong><br>
 <strong>statistics module, 7</strong><br>
 <strong>strings, 5</strong><br>
 <strong>struct module, 28-29</strong><br>
+<strong>super function, 14</strong><br>
 <strong>subprocess module, 25</strong><br>
 <strong>synthesizer, 41</strong><br>
 <strong>sys module, 15, 21, 22</strong> </p>
@@ -140,7 +141,7 @@
 <strong>template function, 36</strong><br>
 <strong>threading module, 30</strong><br>
 <strong>time module, 34, 36</strong><br>
-<strong>tuples, 3</strong><br>
+<strong>tuples, 3, 11</strong><br>
 <strong>type, 4, 31</strong>  </p>
 <h3 id="w">W</h3>
 <p><strong>wave module, 40-41</strong><br>