Regular is related to Grade. Grade is related to Fail. Fail is related to Mark. Mark is related to Line. 
you are likely to find Ass in/at/on Sea. Sea is related to Captain. 
Regular <--RelatedTo--> Grade <--RelatedTo--> Fail <--RelatedTo--> Mark <--RelatedTo--> Line 
Ass --AtLocation--> Sea <--RelatedTo--> Captain 