Remove duplicate word.

episodes/04-changes.md

@@ -30,7 +30,7 @@ $ cd ~/Desktop/recipes
 Let's create a file called `guacamole.md` that contains the basic structure of a recipe.
 We'll use `nano` to edit the file;
 you can use whatever editor you like.
-In particular, this does not have to be the `core.editor` you set globally earlier. But remember, the steps to create create or edit a new file will depend on the editor you choose (it might not be nano). For a refresher on text editors, check out ["Which Editor?"](https://swcarpentry.github.io/shell-novice/03-create.html#which-editor) in [The Unix Shell](https://swcarpentry.github.io/shell-novice/) lesson.
+In particular, this does not have to be the `core.editor` you set globally earlier. But remember, the steps to create or edit a new file will depend on the editor you choose (it might not be nano). For a refresher on text editors, check out ["Which Editor?"](https://swcarpentry.github.io/shell-novice/03-create.html#which-editor) in [The Unix Shell](https://swcarpentry.github.io/shell-novice/) lesson.
 
 ```bash
 $ nano guacamole.md