How many people are in Chişinău, Bălţi, and Ungheni combined?
return people ;return #1 in  Chişinău ;return #1 in  Bălţi ;return #1 in  Ungheni ;return number of  #2 ;return number of  #3 ;return number of  #4 ;return sum of #5 and  #6 ;return sum of #7 and  #8
['select', 'filter', 'filter', 'filter', 'aggregate', 'aggregate', 'aggregate', 'arithmetic', 'arithmetic']