Currency is a different concept from Change. Death is a type of Change. Death is part of War. you are likely to find Army in/at/on War. 
Mail is related to Envelope. Envelope cannot be Alive. Alive is similar to Sensitive. Sensitive is similar to Painful. 
Currency <--DistinctFrom--> Change <--IsA-- Death --PartOf--> War <--AtLocation-- Army 
Mail <--RelatedTo--> Envelope --NotHasProperty--> Alive <--SimilarTo--> Sensitive <--SimilarTo--> Painful 