Ridge is related to Average. Average is related to Standard. Standard is related to Test. Test is related to Multiple. 
Class is related to Peasant. Peasant is related to Worker. Researcher is a type of Worker. 
Ridge <--RelatedTo--> Average <--RelatedTo--> Standard <--RelatedTo--> Test <--RelatedTo--> Multiple 
Class <--RelatedTo--> Peasant <--RelatedTo--> Worker <--IsA-- Researcher 