Demand is related to Come. Come is a type of Change. Extend is a type of Change. Extent is etymologically related to Extend. 
Lunch is related to Work. Work is the opposite of Do. Do is related to Happen. Happen is related to Likely. 
Demand <--RelatedTo--> Come --IsA--> Change <--IsA-- Extend <--EtymologicallyRelatedTo-- Extent 
Lunch <--RelatedTo--> Work <--Antonym--> Do <--RelatedTo--> Happen <--RelatedTo--> Likely 