def cardinality_for(*args)
      args.inject([]) {|results,arg|
        result = :many 
        result = :one if arg.singularize == arg
        results << result        
      }
    end
def cardinality_for(*args)
      args.inject([]) {|results,arg|
        result = :many 
        result = :one if arg.singularize == arg
        results << result        
      }
    end
Determines if the provided string is plural or singular
 Plurality == Cardinality