diff --git a/lab3/README.md b/lab3/README.md
index 4147fb7..b1db494 100644
--- a/lab3/README.md
+++ b/lab3/README.md
@@ -74,7 +74,6 @@ which creates an HTML file you can open in you web browser.
 If you can visualize your trees with any of these tools, that's a very good sign that your file _more or less_ matches the CoNNL-U format!
 
 As a last step, validate your treebank with the official UD validator. 
-
 To do that, clone or download the [UD tools repository](https://github.com/UniversalDependencies/tools), move inside the corresponding folder and run
 
 ```
diff --git a/lectures/lecture-n/arianna/slides.pdf b/lectures/lecture-n/arianna/slides.pdf
index b533c1a..0f44494 100644
Binary files a/lectures/lecture-n/arianna/slides.pdf and b/lectures/lecture-n/arianna/slides.pdf differ