diff --git a/.gitignore b/.gitignore
index e4aa78b..91b77b5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,6 +7,7 @@ main.idx
 main.ilg
 main.ind
 main.out
+main.pdf
 main.run.xml
 main.synctex.gz
 main.toc
diff --git a/main.pdf b/main.pdf
index c953f53..9aee74c 100644
Binary files a/main.pdf and b/main.pdf differ
diff --git a/main.tex b/main.tex
index 84fef43..ae9453e 100644
--- a/main.tex
+++ b/main.tex
@@ -89,10 +89,10 @@
 \begingroup
 %\include{extraTeX/style/headers}
 \include{extraTeX/style/headers_simple}
-%\includechapter{1}{ch_intro_to_data}
-%\includechapter{2}{ch_summarizing_data}
-%\includechapter{3}{ch_probability}
-%\includechapter{4}{ch_distributions}
+\includechapter{1}{ch_intro_to_data}
+\includechapter{2}{ch_summarizing_data}
+\includechapter{3}{ch_probability}
+\includechapter{4}{ch_distributions}
 \includechapter{5}{ch_foundations_for_inf}
 \includechapter{6}{ch_inference_for_props}
 \includechapter{7}{ch_inference_for_means}