How many years was it between when most of Swedish Pomerania and the Duchy of Bremen were taken and when Stralsund fell?
return most of Swedish Pomerania and  the  Duchy of  Bremen were taken ;return Stralsund fell ;return year of #1 ;return year of #2 ;return the  difference of #4 and  #3
['select', 'select', 'project', 'project', 'arithmetic']