question: Find the names of districts where have both city mall and village store type stores.
#1 return districts 
#2 return stores of #1 
#3 return types of #2 
#4 return #1 where #3 is city mall 
#5 return #1 where #3 is village store 
#6 return #1 in  both #4 and  #5 
#7 return names of #6