Drink is related to Name. Refer is a type of Name. Refer is a synonym of Mention. 
Learning can be Free. Free is the opposite of Slavery. Slavery is the opposite of Freedom. Freedom is related to Allow. 
Drink <--RelatedTo--> Name <--IsA-- Refer <--Synonym--> Mention 
Learning --HasProperty--> Free <--Antonym--> Slavery <--Antonym--> Freedom <--RelatedTo--> Allow 