Person wants (to) Achieve. Average is a type of Achieve. 
Chamber is related to Oven. you are likely to find Steak in/at/on Oven. Steak is related to Rub. Rub is related to Push. 
Person --Desires--> Achieve <--IsA-- Average 
Chamber <--RelatedTo--> Oven <--AtLocation-- Steak <--RelatedTo--> Rub <--RelatedTo--> Push 