Add multi-value when example for case statement
Add multi-value when example for case statement
Add lecture 04
Fix the overview slide of lecture 04

We were not able to get to the parallel assignment slides.
Format function result and remove some whitepaces in lecture 04.

Format function result in slide 36 for better view. Remove
whitespaces around operator ** in slides 40 and 45.
Add multi-value when example for case statement
Add multi-value when example for case statement
Add multi-value when example for case statement
Add multi-value when case statement example
Add multi-value when case statement example