Bubble is a type of Illusion. Bubble is related to Air. 
General is related to Alcohol. Alcohol is related to Shot. Shot is related to Arrow. Arrow is related to Killing. 
Illusion <--IsA-- Bubble <--RelatedTo--> Air 
General <--RelatedTo--> Alcohol <--RelatedTo--> Shot <--RelatedTo--> Arrow <--RelatedTo--> Killing 