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diff --git a/_quarto.yml b/_quarto.yml
@@ -17,32 +17,32 @@ book:
     chapters:
         - index.md
         - intro_lec/introduction.qmd
-        # - pandas_1/pandas_1.qmd
-        # - pandas_2/pandas_2.qmd
-        # - pandas_3/pandas_3.qmd
-        # - eda/eda.qmd
-        # - regex/regex.qmd
-        # - visualization_1/visualization_1.qmd
-        # - visualization_2/visualization_2.qmd
-        # - sampling/sampling.qmd
-        # - intro_to_modeling/intro_to_modeling.qmd
-        # - constant_model_loss_transformations/loss_transformations.qmd
-        # - ols/ols.qmd
-        # - gradient_descent/gradient_descent.qmd
-        # - feature_engineering/feature_engineering.qmd
-        # - case_study_HCE/case_study_HCE.qmd
-        # - cv_regularization/cv_reg.qmd
-        # - probability_1/probability_1.qmd
-        # - probability_2/probability_2.qmd
-        # - inference_causality/inference_causality.qmd
-        # # - case_study_climate/case_study_climate.qmd
-        # - sql_I/sql_I.qmd
-        # - sql_II/sql_II.qmd
-        # - logistic_regression_1/logistic_reg_1.qmd
-        # - logistic_regression_2/logistic_reg_2.qmd
-        # - pca_1/pca_1.qmd
-        # - pca_2/pca_2.qmd
-        # - clustering/clustering.qmd
+        - pandas_1/pandas_1.qmd
+        - pandas_2/pandas_2.qmd
+        - pandas_3/pandas_3.qmd
+        - eda/eda.qmd
+        - regex/regex.qmd
+        - visualization_1/visualization_1.qmd
+        - visualization_2/visualization_2.qmd
+        - sampling/sampling.qmd
+        - intro_to_modeling/intro_to_modeling.qmd
+        - constant_model_loss_transformations/loss_transformations.qmd
+        - ols/ols.qmd
+        - gradient_descent/gradient_descent.qmd
+        - feature_engineering/feature_engineering.qmd
+        - case_study_HCE/case_study_HCE.qmd
+        - cv_regularization/cv_reg.qmd
+        - probability_1/probability_1.qmd
+        - probability_2/probability_2.qmd
+        - inference_causality/inference_causality.qmd
+        # - case_study_climate/case_study_climate.qmd
+        - sql_I/sql_I.qmd
+        - sql_II/sql_II.qmd
+        - logistic_regression_1/logistic_reg_1.qmd
+        - logistic_regression_2/logistic_reg_2.qmd
+        - pca_1/pca_1.qmd
+        - pca_2/pca_2.qmd
+        - clustering/clustering.qmd
 
     sidebar:
         logo: "data100_logo.png"

diff --git a/docs/Principles-and-Techniques-of-Data-Science.pdf b/docs/Principles-and-Techniques-of-Data-Science.pdf
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diff --git a/docs/constant_model_loss_transformations/images/bulge.png b/docs/constant_model_loss_transformations/images/bulge.png
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diff --git a/docs/index.html b/docs/index.html
@@ -132,6 +132,156 @@
   <a href="./intro_lec/introduction.html" class="sidebar-item-text sidebar-link">
  <span class="menu-text"><span class="chapter-number">1</span>&nbsp; <span class="chapter-title">Introduction</span></span></a>
   </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./pandas_1/pandas_1.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">2</span>&nbsp; <span class="chapter-title">Pandas I</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./pandas_2/pandas_2.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">3</span>&nbsp; <span class="chapter-title">Pandas II</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./pandas_3/pandas_3.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">4</span>&nbsp; <span class="chapter-title">Pandas III</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./eda/eda.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">5</span>&nbsp; <span class="chapter-title">Data Cleaning and EDA</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./regex/regex.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">6</span>&nbsp; <span class="chapter-title">Regular Expressions</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./visualization_1/visualization_1.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">7</span>&nbsp; <span class="chapter-title">Visualization I</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./visualization_2/visualization_2.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">8</span>&nbsp; <span class="chapter-title">Visualization II</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./sampling/sampling.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">9</span>&nbsp; <span class="chapter-title">Sampling</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./intro_to_modeling/intro_to_modeling.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">10</span>&nbsp; <span class="chapter-title">Introduction to Modeling</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./constant_model_loss_transformations/loss_transformations.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">11</span>&nbsp; <span class="chapter-title">Constant Model, Loss, and Transformations</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./ols/ols.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">12</span>&nbsp; <span class="chapter-title">Ordinary Least Squares</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./gradient_descent/gradient_descent.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">13</span>&nbsp; <span class="chapter-title">sklearn and Gradient Descent</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./feature_engineering/feature_engineering.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">14</span>&nbsp; <span class="chapter-title">Feature Engineering</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./case_study_HCE/case_study_HCE.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">15</span>&nbsp; <span class="chapter-title">Case Study in Human Contexts and Ethics</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./cv_regularization/cv_reg.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">16</span>&nbsp; <span class="chapter-title">Cross Validation and Regularization</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./probability_1/probability_1.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">17</span>&nbsp; <span class="chapter-title">Random Variables</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./probability_2/probability_2.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">18</span>&nbsp; <span class="chapter-title">Estimators, Bias, and Variance</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./inference_causality/inference_causality.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">19</span>&nbsp; <span class="chapter-title">Causal Inference and Confounding</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./sql_I/sql_I.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">20</span>&nbsp; <span class="chapter-title">SQL I</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./sql_II/sql_II.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">21</span>&nbsp; <span class="chapter-title">SQL II</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./logistic_regression_1/logistic_reg_1.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">22</span>&nbsp; <span class="chapter-title">Logistic Regression I</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./logistic_regression_2/logistic_reg_2.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">23</span>&nbsp; <span class="chapter-title">Logistic Regression II</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./pca_1/pca_1.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">24</span>&nbsp; <span class="chapter-title">PCA I</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./pca_2/pca_2.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">25</span>&nbsp; <span class="chapter-title">PCA II</span></span></a>
+  </div>
+</li>
+        <li class="sidebar-item">
+  <div class="sidebar-item-container"> 
+  <a href="./clustering/clustering.html" class="sidebar-item-text sidebar-link">
+ <span class="menu-text"><span class="chapter-number">26</span>&nbsp; <span class="chapter-title">Clustering</span></span></a>
+  </div>
 </li>
     </ul>
     </div>

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