Vaccine is related to Shot. Shot is related to Gun. Gun is related to Aim. Pistol can be used for Aim. 
Coal is related to Acid. Acid can be Fun. Toy can be used for Fun. Toy is related to Intent. 
Vaccine <--RelatedTo--> Shot <--RelatedTo--> Gun <--RelatedTo--> Aim <--UsedFor-- Pistol 
Coal <--RelatedTo--> Acid --HasProperty--> Fun <--UsedFor-- Toy <--RelatedTo--> Intent 