Invade is a type of Attack. Attack is related to Stroke. Stroke is a type of Mark. 
Patent is related to Intellectual. Intellectual is related to Reason. Speculate is a type of Reason. 
Invade --IsA--> Attack <--RelatedTo--> Stroke --IsA--> Mark 
Patent <--RelatedTo--> Intellectual <--RelatedTo--> Reason <--IsA-- Speculate 