diff --git a/index.jl b/index.jl
index 29e09f8..f98dcfc 100644
--- a/index.jl
+++ b/index.jl
@@ -4,16 +4,15 @@
 using Markdown
 using InteractiveUtils
 
+# ╔═╡ 322a1b28-48a7-4df0-87a1-4259a6abc9ee
+ using HypertextLiteral, PlutoUI; TableOfContents()
+
 # ╔═╡ 24eb2142-1d07-4412-842f-8aacbaf58c16
 begin
-	using HypertextLiteral
 	html_string = join(readlines("header.html"), "\n")
 	HypertextLiteral.@htl("""$(HypertextLiteral.Bypass(html_string))""")
 end
 
-# ╔═╡ 322a1b28-48a7-4df0-87a1-4259a6abc9ee
- using PlutoUI; TableOfContents()
-
 # ╔═╡ 2ce416e8-bb3d-11ee-3a9f-8dcc9a81f83c
 md"""
 Welcome to the **Tidier Course**, a course designed to introduce you to Julia and the Tidier.jl ecosystem for data analysis. The course consists of a series of Jupyter Notebooks so that you can both learn and practice how to write Julia code through real data science examples.
diff --git a/what-is-tidier-jl.jl b/what-is-tidier-jl.jl
index fe6f5d9..f29f1ae 100644
--- a/what-is-tidier-jl.jl
+++ b/what-is-tidier-jl.jl
@@ -4,15 +4,8 @@
 using Markdown
 using InteractiveUtils
 
-# ╔═╡ daf77ffe-a06d-489b-9fff-ce84d377c86f
-begin
-	using HypertextLiteral
-	html_string = join(readlines("header.html"), "\n")
-	HypertextLiteral.@htl("""$(HypertextLiteral.Bypass(html_string))""")
-end
-
 # ╔═╡ 34de12cb-2e15-4f12-93e0-0a897ce5fa9c
- using PlutoUI; TableOfContents()
+ 	using HypertextLiteral, PlutoUI; TableOfContents()
 
 # ╔═╡ bd1cbde7-42eb-45a1-9296-f17d3b9c76bc
 using Tidier
@@ -20,6 +13,12 @@ using Tidier
 # ╔═╡ d33059a4-4774-4c4a-89c8-cba7a8032acd
 using ZipFile, CSV, Dates
 
+# ╔═╡ daf77ffe-a06d-489b-9fff-ce84d377c86f
+begin
+	html_string = join(readlines("header.html"), "\n")
+	HypertextLiteral.@htl("""$(HypertextLiteral.Bypass(html_string))""")
+end
+
 # ╔═╡ 9d465a8f-a418-4fe6-bebc-7f9c7aa632cf
 md"""
 # What is Tidier.jl?
@@ -88,7 +87,7 @@ patients = CSV.read(zip_file.files[18], DataFrame);
 meds = CSV.read(zip_file.files[2], DataFrame);
 
 # ╔═╡ c3bfa1a8-2651-454a-846f-fd1b4527eac4
-@glimpse patients 
+@glimpse patients
 
 # ╔═╡ 5631379e-abaa-44cf-931e-6e5fa60e9353
 md"""