Sack is a type of Bag. you are likely to find Cat in/at/on Bag. 
Injury is related to Hospital. Hospital is related to Station. Station is related to Gas. Gas is related to Pump. 
Sack --IsA--> Bag <--AtLocation-- Cat 
Injury <--RelatedTo--> Hospital <--RelatedTo--> Station <--RelatedTo--> Gas <--RelatedTo--> Pump 