Related is related to Oil. Oil is related to Art. Art can be Philosophical. 
Specialist is a type of Doctor. Doctor is related to Person. Civilian is a type of Person. Refugee is a type of Civilian. 
Related <--RelatedTo--> Oil <--RelatedTo--> Art --HasProperty--> Philosophical 
Specialist --IsA--> Doctor <--RelatedTo--> Person <--IsA-- Civilian <--IsA-- Refugee 