Arrow is a type of Weapon. Stone can be used for Weapon. you are likely to find Stone in/at/on Pond. 
Rib is related to Prime. Prime is a synonym of Ground. Ground is the opposite of Roof. 
Arrow --IsA--> Weapon <--UsedFor-- Stone --AtLocation--> Pond 
Rib <--RelatedTo--> Prime <--Synonym--> Ground <--Antonym--> Roof 