diff --git a/appB.jl b/appB.jl
index 2863824..f6327b9 100644
--- a/appB.jl
+++ b/appB.jl
@@ -186,6 +186,8 @@ proptable([walk_unique_2ahead() for _ in 1:10^5])
 # Code for exercise 11.1
 
 @time wide = DataFrame(ones(1, 10_000), :auto);
+@time wide = DataFrame(ones(1, 10_000), :auto);
+@time Tables.columntable(wide);
 @time Tables.columntable(wide);
 
 # Code for exercise 11.2
diff --git a/ch09.jl b/ch09.jl
index 6c5398c..ea86978 100644
--- a/ch09.jl
+++ b/ch09.jl
@@ -88,8 +88,6 @@ df1 = puzzles[:, ["Rating", "Popularity"]];
 df2 = puzzles[!, ["Rating", "Popularity"]];
 
 df1 == df2
-df1 == puzzles
-df2 == puzzles
 
 df1.Rating === puzzles.Rating
 df1.Popularity === puzzles.Popularity