How many more males under the age of six were there compared to females under the age of six?
return males ;return females ;return #1 that are under the  age  of six ;return #2 that are under the  age  of six ;return number of  #3 ;return number of  #4 ;return the  difference of #5 and  #6
['select', 'select', 'filter', 'filter', 'aggregate', 'aggregate', 'arithmetic']