Butter is made of Milk. Butter is a type of Grocery. Grocery is related to Egg. Egg is related to Hard. 
Secretary is related to Job. Job is related to Office. you are likely to find Writer in/at/on Office. 
Milk <--MadeOf-- Butter --IsA--> Grocery <--RelatedTo--> Egg <--RelatedTo--> Hard 
Secretary <--RelatedTo--> Job <--RelatedTo--> Office <--AtLocation-- Writer 