Ground is related to Metal. Metal is related to Handle. Handle is related to Bat. 
Box is related to Empty. Empty is the opposite of Crowd. Crowd is related to Fan. 
Ground <--RelatedTo--> Metal <--RelatedTo--> Handle <--RelatedTo--> Bat 
Box <--RelatedTo--> Empty <--Antonym--> Crowd <--RelatedTo--> Fan 