Airport is related to Tower. Tower is related to Trade. Trade is related to Action. Aggression is a type of Action. 
Expense is related to Account. Account is related to Related. Related is related to Cross. Cross is similar to Dot. 
Airport <--RelatedTo--> Tower <--RelatedTo--> Trade <--RelatedTo--> Action <--IsA-- Aggression 
Expense <--RelatedTo--> Account <--RelatedTo--> Related <--RelatedTo--> Cross <--SimilarTo--> Dot 