How many of the population in 1791 were not white or slaves?
return the  population ;return #1 in  1791 ;return #2 that were white ;return #2 that were slaves ;return number of  #1 ;return number of  #3 ;return number of  #4 ;return sum of #6 and  #7 ;return difference of #5 and  #8
['select', 'filter', 'filter', 'filter', 'aggregate', 'aggregate', 'aggregate', 'arithmetic', 'arithmetic']