-------------------------------------------------------------------------- 
  
   F    Am   B   C#

 :----1----0----1----3----:
 :----1----1----3----5----:
 :----2----2----3----5----:
 :----3----2----3----5----:
 :----3----0----1----3----:
 :----1----0----1----3----:

That's the main idea.

---------------------------------------------------------------------------