Long is related to Story. Western is a type of Story. Western is related to Horse. Horse is related to Father. 
Helmet is related to Metal. Metal is related to Rocket. Rocket is a synonym of Book. 
Long <--RelatedTo--> Story <--IsA-- Western <--RelatedTo--> Horse <--RelatedTo--> Father 
Helmet <--RelatedTo--> Metal <--RelatedTo--> Rocket <--Synonym--> Book 