Degree is related to Single. Single is related to Bite. Bite is related to Bullet. Bullet is related to Pistol. 
Tray is related to Implement. Bar is a type of Implement. 
Degree <--RelatedTo--> Single <--RelatedTo--> Bite <--RelatedTo--> Bullet <--RelatedTo--> Pistol 
Tray <--RelatedTo--> Implement <--IsA-- Bar 