Factory is related to Mass. Mass is related to Conservation. Conservation is related to Law. Principle is a type of Law. 
Happiness is derived from Happy. Happy is related to Fun. you would Pretend because Fun. one thing you do when you Pretend is Laughter. 
Factory <--RelatedTo--> Mass <--RelatedTo--> Conservation <--RelatedTo--> Law <--IsA-- Principle 
Happiness --DerivedFrom--> Happy <--RelatedTo--> Fun <--MotivatedByGoal-- Pretend --HasSubevent--> Laughter 