Sake is a type of Benefit. Benefit is a synonym of Help. Mayor can be used for Help. Mayor is related to Town. 
Phrase is related to Question. Question is related to Doubt. Doubt is related to Answer. 
Sake --IsA--> Benefit <--Synonym--> Help <--UsedFor-- Mayor <--RelatedTo--> Town 
Phrase <--RelatedTo--> Question <--RelatedTo--> Doubt <--RelatedTo--> Answer 