Fan is related to Blow. Blow is related to Wind. 
Free is related to Bonus. Bonus is a type of Payment. Payment is related to Transfer. Assign is a type of Transfer. 
Fan <--RelatedTo--> Blow <--RelatedTo--> Wind 
Free <--RelatedTo--> Bonus --IsA--> Payment <--RelatedTo--> Transfer <--IsA-- Assign 