Leg is related to Sock. Sock is a type of Hit. 
Engineer is a type of Person. you are likely to find Engineer in/at/on Vacation. Vacation is related to Summer. Summer is the opposite of Christmas. 
Leg <--RelatedTo--> Sock --IsA--> Hit 
Person <--IsA-- Engineer --AtLocation--> Vacation <--RelatedTo--> Summer <--Antonym--> Christmas 