Working is related to Class. Class is related to Subject. Subject is a synonym of Capable. 
Box is related to Object. Object is related to Weight. Weight is related to Heavy. Heavy is related to Gravity. 
Working <--RelatedTo--> Class <--RelatedTo--> Subject <--Synonym--> Capable 
Box <--RelatedTo--> Object <--RelatedTo--> Weight <--RelatedTo--> Heavy <--RelatedTo--> Gravity 