Fat is a type of Nutrient. Butter is a type of Fat. you are likely to find Butter in/at/on Refrigerator. 
Work is related to Course. Course is related to Section. Section is part of Band. Band is related to Rolling. 
Nutrient <--IsA-- Fat <--IsA-- Butter --AtLocation--> Refrigerator 
Work <--RelatedTo--> Course <--RelatedTo--> Section --PartOf--> Band <--RelatedTo--> Rolling 