How many years after the death of Waleran IV, Duke of Limburg did his daughter Ermengarde of Limburg die?
return the  death of   Waleran IV ,  Duke of Limburg  ;return his daughter Ermengarde of   Limburg  die ;return when  was  #1 ;return when  was  #2 ;return difference of   #4 and  #3 in  years
['select', 'select', 'project', 'project', 'arithmetic']