Pen is the Book. Fire is a type of Book. Fire is related to Alarm. Alarm is related to Bedroom. 
Southwest is a type of Direction. Southeast is a type of Direction. Southeast is similar to Northwest. Northwest is part of West. 
Pen --DefinedAs--> Book <--IsA-- Fire <--RelatedTo--> Alarm <--RelatedTo--> Bedroom 
Southwest --IsA--> Direction <--IsA-- Southeast <--SimilarTo--> Northwest --PartOf--> West 