Specialist is derived from Specialize. 
you are likely to find Beam in/at/on Barn. Barn is related to Pig. you are likely to find Pig in/at/on Porch. you are likely to find Chair in/at/on Porch. 
Specialist --DerivedFrom--> Specialize 
Beam --AtLocation--> Barn <--RelatedTo--> Pig --AtLocation--> Porch <--AtLocation-- Chair 