Corporation is related to Voting. Voting is a synonym of Vote. Election is a type of Vote. 
House can be used for Protection. Protection is related to Helmet. Helmet is related to Head. Head is related to Mayor. 
Corporation <--RelatedTo--> Voting <--Synonym--> Vote <--IsA-- Election 
House --UsedFor--> Protection <--RelatedTo--> Helmet <--RelatedTo--> Head <--RelatedTo--> Mayor 