diff --git a/kkkk.pdf b/kkkk.pdf
index 3d65c14..61f39e9 100644
Binary files a/kkkk.pdf and b/kkkk.pdf differ
diff --git a/kkkk.tex b/kkkk.tex
index 7037290..a7e8700 100644
--- a/kkkk.tex
+++ b/kkkk.tex
@@ -1,6 +1,6 @@
 \documentclass[twoside,12pt,a4paper,english]{book}
 
-% \includeonly{luku17}
+%\includeonly{luku18}
 
 \usepackage[english]{babel}
 \usepackage[utf8]{inputenc}
@@ -91,7 +91,7 @@
 \include{luku15}
 \include{luku16}
 \include{luku17}
-% \include{luku18}
+\include{luku18}
 % \include{luku19}
 % \include{luku20}
 \part{Advanced topics}