question: In 2016 how many more neighborhood markets than supercenters did Walmart open?
#1 return Walmart 
#2 return neighborhood markets that #1 open 
#3 return supercenters that #1 open 
#4 return #2 In 2016 
#5 return #3 In 2016 
#6 return number of  #4 
#7 return number of  #5 
#8 return difference of #6 and  #7