Express is the opposite of Slow. Slow is a synonym of Dense. 
People is related to Earth. Earth is a type of Thing. Thing is related to Lock. Lock is related to Fist. 
Express <--Antonym--> Slow <--Synonym--> Dense 
People <--RelatedTo--> Earth --IsA--> Thing <--RelatedTo--> Lock <--RelatedTo--> Fist 