Roman is related to Mass. Mass is related to Field. you are likely to find Row in/at/on Field. Row is a type of Array. 
Seed is related to Round. Round is related to Disc. 
Roman <--RelatedTo--> Mass <--RelatedTo--> Field <--AtLocation-- Row --IsA--> Array 
Seed <--RelatedTo--> Round <--RelatedTo--> Disc 