--- a/slides/slides02.tex	Tue Oct 08 05:53:21 2013 +0100
+++ b/slides/slides02.tex	Tue Oct 08 11:57:05 2013 +0100
@@ -14,7 +14,7 @@
 \usetikzlibrary{arrows}
 \usetikzlibrary{automata}
 \usetikzlibrary{shapes}
-\usetikzlibrary{shadows}
+\usetikzlibrary{shadows}Net
 \usetikzlibrary{positioning}
 \usetikzlibrary{calc}
 \usepackage{graphicx}