Front is related to Introduction. Introduction is a type of Textbook. Reader is a type of Textbook. 
Stay is related to Action. Action is related to Be. Balance is a type of Be. Balanced is a form of Balance. 
Front <--RelatedTo--> Introduction --IsA--> Textbook <--IsA-- Reader 
Stay <--RelatedTo--> Action <--RelatedTo--> Be <--IsA-- Balance <--FormOf-- Balanced 