Duty is related to Army. Army is related to Captain. Captain is related to Occupation. Occupation is related to Seller. 
Row is a type of Sequence. you are likely to find Row in/at/on Table. you are likely to find Table in/at/on Meeting. 
Duty <--RelatedTo--> Army <--RelatedTo--> Captain <--RelatedTo--> Occupation <--RelatedTo--> Seller 
Sequence <--IsA-- Row --AtLocation--> Table --AtLocation--> Meeting 