Ribbon is related to Red. Red is related to Flag. 
Slavery is the opposite of Liberty. Liberty is related to Symbol. Symbol is related to Meaning. Reference is a type of Meaning. 
Ribbon <--RelatedTo--> Red <--RelatedTo--> Flag 
Slavery <--Antonym--> Liberty <--RelatedTo--> Symbol <--RelatedTo--> Meaning <--IsA-- Reference 