Ear is related to Face. Face is related to Skull. Skull is related to Scary. 
Agent is a type of Official. Agent is related to Detective. Detective is related to Investigation. 
Ear <--RelatedTo--> Face <--RelatedTo--> Skull <--RelatedTo--> Scary 
Official <--IsA-- Agent <--RelatedTo--> Detective <--RelatedTo--> Investigation 