Inspector is a type of Policeman. Policeman is related to Ball. Ball is related to Bat. 
Scale is related to Measurement. Measurement is related to Length. Length is a type of Extent. 
Inspector --IsA--> Policeman <--RelatedTo--> Ball <--RelatedTo--> Bat 
Scale <--RelatedTo--> Measurement <--RelatedTo--> Length --IsA--> Extent 