Primary is related to Main. Main is related to Course. Course is a synonym of Medicine. Medicine is related to Cotton. 
Association is related to Bar. Bar is related to Gold. Gold is related to Mine. Mine is related to Ownership. 
Primary <--RelatedTo--> Main <--RelatedTo--> Course <--Synonym--> Medicine <--RelatedTo--> Cotton 
Association <--RelatedTo--> Bar <--RelatedTo--> Gold <--RelatedTo--> Mine <--RelatedTo--> Ownership 