Assignment is a synonym of Presentation. Presentation is a type of Show. Demonstration is a type of Show. 
Rib is related to Rack. Rack is related to Shelf. you are likely to find Food in/at/on Shelf. Pizza is a type of Food. 
Assignment <--Synonym--> Presentation --IsA--> Show <--IsA-- Demonstration 
Rib <--RelatedTo--> Rack <--RelatedTo--> Shelf <--AtLocation-- Food <--IsA-- Pizza 