PowerPivot and Many to Many Relationships

If you have already read this post from Marco Russo and have understood everything, then this new post of mine will be useless. But if you are like me, i.e. you have read it and have broken your head trying to understand the final (really smart!) formula, then this new post might help you to understand it better. Thus, this post does not contain anything new, it only shows graphically how to make many to many relationships work fast with PowerPivot.