Who served as a Livonian Master last: Hermann Balk or Godert Kettler?
return Hermann Balk served as a Livonian Master ;return Godert Kettler served as a Livonian Master ;return when  was  #1 ;return when  was  #2 ;return which is highest of #3 ,  #4
['select', 'select', 'project', 'project', 'comparison']