How many years after the revolution did the Armenian and Azerbaijani Republics end up being part of the Soviet Union?
return the  revolution ;return the  Armenian and  Azerbaijani Republics end up being part of the   Soviet Union ;return year of #1 ;return year of #2 ;return the  difference of #4 and  #3
['select', 'select', 'project', 'project', 'arithmetic']