How many more people are in Chişinău and Bălţi combined compared to Cahul, Soroca, and Orhei combined?
return people ;return #1 in  Chişinău ;return #1 in  Bălţi ;return #2 ,  #3 ;return number of  #4 ;return #1 in  Cahul ;return #1 in  Soroca ;return #1 in  Orhei ;return #5 ,  #6 ,   #7 ;return number of  #9 ;return difference of #5 and  #10
['select', 'filter', 'filter', 'union', 'aggregate', 'filter', 'filter', 'filter', 'union', 'aggregate', 'arithmetic']