you would Fence because Privacy. Fence requires Practice. Heritage is a type of Practice. Heritage is a synonym of Legacy. 
Legal is related to Plea. Plea is related to Agreement. 
Privacy <--MotivatedByGoal-- Fence --HasPrerequisite--> Practice <--IsA-- Heritage <--Synonym--> Legacy 
Legal <--RelatedTo--> Plea <--RelatedTo--> Agreement 