--- a/hws/hw01.tex	Sat Nov 01 15:06:41 2014 +0000
+++ b/hws/hw01.tex	Sat Nov 01 16:19:05 2014 +0000
@@ -42,7 +42,9 @@
 \item How is the power of a language defined? (Hint: There are two
   rules, one for $\_^0$ and one for $\_^{n+1}$.)
 
-\item Let $A = \{[], [a], [b], [c]\}$. How many strings are in $A^4$?
+\item Let $A = \{[a], [b], [c], [d]\}$. How many strings are in $A^4$?
+  Consider the case of $A^4$ where one of the strings in $A$ is the 
+  empty string.
 
 \item How many regular expressions are there to match the string
   $abc$? How many if they cannot include $\epsilon$ and $\varnothing$?