question_text: How many days before the end of the negotiating of the Anglo-Irish Treaty was a decision taken to recommend the treaty to Dáil Éireann?
decomposition: return day when  a decision was  taken to recommend the  treaty to  Dáil Éireann ;return on what  day was  the  end of the   negotiating of  the    Anglo-Irish Treaty ;return the  difference of #2 and  #1