--- a/handouts/ho04.tex	Tue Nov 04 12:35:41 2014 +0000
+++ b/handouts/ho04.tex	Wed Nov 05 12:01:05 2014 +0000
@@ -2,8 +2,6 @@
 \usepackage{../style}
 \usepackage{../langs}
 
-\usetikzlibrary{patterns,decorations.pathreplacing}
-
 \begin{document}
 
 \section*{Handout 4 (Access Control)}