How many years wnet by between the last raid on Upper Chindwina and the raja presenting his daughter to Ava?
return the  last raid on Upper Chindwina ;return the  raja presenting his daughter to Ava ;return year of #1 ;return year of #2 ;return the  difference of #4 and  #3
['select', 'select', 'project', 'project', 'arithmetic']