--- a/hws/hw01.tex	Sun Sep 24 17:47:52 2017 +0100
+++ b/hws/hw01.tex	Sun Sep 24 17:51:31 2017 +0100
@@ -34,7 +34,7 @@
 
 \noindent
 Think of ways how you can cheat in this exam? How would you defend
-against such cheats.
+against such cheats?
 
 \item Here is another puzzle where you can practice thinking
       like an attacker: Consider modern car keys. They
@@ -53,7 +53,7 @@
       by. How can this transmitted data be abused, if not
       properly encrypted? If you identified an abuse, then how
       would you encrypt the data so that such an abuse is
-      prevented. Hint: Consider the fact that every person
+      prevented? Hint: Consider the fact that every person
       uses approximately 120l of water every day.
 
 %\item And another one: Nowadays everybody and their