How many days after the French occupied towns such as Frankfurt, Hanau and Darmstadt did the Reichswehr control all of the northern Ruhr area?
return the  French occupied towns such as Frankfurt ,  Hanau and  Darmstadt ;return the  Reichswehr did control all of the   northern Ruhr area ;return when  was  #1 ;return when  was  #2 ;return difference of #3 and  #4 in  days
['select', 'select', 'project', 'project', 'arithmetic']