How many years elapsed between the Siege of Kut and the release of the Central Power prisoners of the Allies and Russia?
return the  Siege of   Kut ;return the  release of   the   Central Power prisoners of the    Allies and  Russia ;return year of   #1 ;return year of   #2 ;return difference of   #3 and  #4
['select', 'select', 'project', 'project', 'arithmetic']