Hard is related to Desk. you are likely to find Dirt in/at/on Desk. Dirt is a type of Soil. 
Event is related to History. History is related to Fact. Fact is the opposite of Belief. 
Hard <--RelatedTo--> Desk <--AtLocation-- Dirt --IsA--> Soil 
Event <--RelatedTo--> History <--RelatedTo--> Fact <--Antonym--> Belief 