Let assert

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diff --git a/src/content/chapter5_advanced_features/lesson04_externals/code.gleam b/src/content/chapter5_advanced_features/lesson04_externals/code.gleam
deleted file mode 100644
index 1101b82..0000000
--- a/src/content/chapter5_advanced_features/lesson04_externals/code.gleam
+++ /dev/null
@@ -1,17 +0,0 @@
-import gleam/io
-
-// A type with no Gleam constructors
-pub type DateTime
-
-// An external function that creates an instance of the type
-@external(javascript, "./my_package_ffi.mjs", "now")
-pub fn now() -> DateTime
-
-// The `now` function in `./my_package_ffi.mjs` looks like this:
-// export function now() {
-//   return new Date();
-// }
-
-pub fn main() {
-  io.debug(now())
-}
diff --git a/src/content/chapter5_advanced_features/lesson04_externals/en.html b/src/content/chapter5_advanced_features/lesson04_externals/en.html
deleted file mode 100644
index 8815fa7..0000000
--- a/src/content/chapter5_advanced_features/lesson04_externals/en.html
+++ /dev/null
@@ -1,25 +0,0 @@
-<p>
-  Sometimes in our projects we want to use code written in other languages, most
-  commonly Erlang and JavaScript, depending on which runtime is being used.
-  Gleam's <em>external functions</em> and <em>external types</em> allow us to
-  import and use this non-Gleam code.
-</p>
-<p>
-  An external type is one that has no constructors. Gleam doesn't know what
-  shape it has or how to create one, it only knows that it exists.
-</p>
-<p>
-  An external function is one that has the <code>@external</code> attribute on
-  it, directing the compiler to use the specified module function as the
-  implementation, instead of Gleam code.
-</p>
-<p>
-  The compiler can't tell the types of functions written in other languages, so
-  when the external attribute is given type annotations must be provided. Gleam
-  trusts that the type given is correct so an inaccurate type annotation can
-  result in unexpected behaviour and crashes at runtime. Be careful!
-</p>
-<p>
-  External functions are useful but should be used sparingly. Prefer to write
-  Gleam code where possible.
-</p>