--- a/hws/hw04.tex	Tue Oct 28 06:01:00 2014 +0000
+++ b/hws/hw04.tex	Tue Oct 28 12:24:11 2014 +0000
@@ -1,8 +1,6 @@
 \documentclass{article}
 \usepackage{../style}
-
-\usepackage{tikz}
-\usetikzlibrary{automata}
+\usepackage{../graphics}
 
 \begin{document}