Expensive is related to Steak. Steak is related to Meat. 
Core is a synonym of Sum. Sum is a synonym of Meat. Meat have Protein. Protein is similar to Carbohydrate. 
Expensive <--RelatedTo--> Steak <--RelatedTo--> Meat 
Core <--Synonym--> Sum <--Synonym--> Meat --HasA--> Protein <--SimilarTo--> Carbohydrate 