How many weeks after the small uprising in Rijeka Crnojevića did the Greens initiate a siege on Cetinje?
return the  small uprising in  Rijeka Crnojevića ;return the  Greens initiate a on Cetinje ;return when  was  #1 ;return when  was  #2 ;return difference of #4 and  #3 initiate weeks
['select', 'select', 'project', 'project', 'arithmetic']