lesson-4.md

@@ -33,4 +33,5 @@ Follow the instructions given in the lesson plan \[1\].
 This is not the conclusion your looking for!!!!
 
 ## References ##
+
 \[1\] : [Lesson Plan](http://legolab.cs.au.dk/DigitalControl.dir/NXT/Lesson4.dir/Lesson.html)