    # File lib/facets/more/behavior.rb, line 6
        def define(behavior, &body)
        if body
          define_method(behavior, &body)
        else
          behavior.each do |behavior, body|
            if body
              define_method(behavior, &body)
            elsif body.nil?
              remove_method(behavior)
            else
              undef_method(behavior)
            end
          end
        end
      end