Citizen is derived from City. Citizen is the opposite of Subject. Subject is related to Art. Art can be Philosophical. 
Develop is a type of Happen. Develop is related to Invent. 
City <--DerivedFrom-- Citizen <--Antonym--> Subject <--RelatedTo--> Art --HasProperty--> Philosophical 
Happen <--IsA-- Develop <--RelatedTo--> Invent 