How many years passed from when Armenia gave way to communist power to when Drastamat Kanayan sent a telegram to Njdeh?
return Armenia gave way to communist power ;return Drastamat Kanayan sent a telegram to Njdeh ;return year of #1 ;return year of #2 ;return difference of #3 and  #4
['select', 'select', 'project', 'project', 'arithmetic']