Spy is related to Mystery. Mystery is related to Genre. Genre is related to Fantasy. Fantasy is related to Novel. 
Colony is related to Social. Social is related to Introduce. Debut is a type of Introduce. 
Spy <--RelatedTo--> Mystery <--RelatedTo--> Genre <--RelatedTo--> Fantasy <--RelatedTo--> Novel 
Colony <--RelatedTo--> Social <--RelatedTo--> Introduce <--IsA-- Debut 