Extra is a type of Edition. Extra is related to Great. Great is related to Fantastic. 
Poster is related to Bedroom. Bedroom is related to Cell. Cell is related to Research. Research is related to Scientific. 
Edition <--IsA-- Extra <--RelatedTo--> Great <--RelatedTo--> Fantastic 
Poster <--RelatedTo--> Bedroom <--RelatedTo--> Cell <--RelatedTo--> Research <--RelatedTo--> Scientific 