Pump is related to Fill. Load is a type of Fill. Pack is a type of Load. 
Hat is related to Habit. Habit is related to Break. Break is related to Period. Period is related to Pain. 
Pump <--RelatedTo--> Fill <--IsA-- Load <--IsA-- Pack 
Hat <--RelatedTo--> Habit <--RelatedTo--> Break <--RelatedTo--> Period <--RelatedTo--> Pain 