diff --git a/src/Advanced/De Bruijn/parts/3 line.tex b/src/Advanced/De Bruijn/parts/3 line.tex
index 0454474..7ec93d0 100644
--- a/src/Advanced/De Bruijn/parts/3 line.tex	
+++ b/src/Advanced/De Bruijn/parts/3 line.tex	
@@ -49,7 +49,6 @@ Have an instructor check your solution.
 				(0) edge (2)
 				(2) edge (3)
 				(2) edge[bend left] (4)
-				(4) edge[bend left] (2)
 				(3) edge (1)
 				(4) edge (3)
 				(4) edge[loop right] (4)
diff --git a/src/Advanced/De Bruijn/parts/4 sturmian.tex b/src/Advanced/De Bruijn/parts/4 sturmian.tex
index 97b87f0..9a51de6 100644
--- a/src/Advanced/De Bruijn/parts/4 sturmian.tex	
+++ b/src/Advanced/De Bruijn/parts/4 sturmian.tex	
@@ -375,7 +375,7 @@ Construct a minimal Sturmain word of order 5.
 
 
 \problem{}
-Argue that the words we get by \ref{sturmanthm} are minimal Sturmain words. \par
+Show that the words we get by \ref{sturmanthm} are minimal Sturmain words. \par
 That is, the word $w$ has length $2n$ and $\mathcal{S}_m(w) = m + 1$ for all $m \leq n$.
 
 \begin{solution}