How many more of the fifth book sold than the fourth and second?
return fifth books sold ;return fourth books sold ;return second books sold ;return number of  #1 ;return number of  #2 ;return number of  #3 ;return sum of #5 and  #6 ;return the  difference of #4 and  #7
['select', 'select', 'select', 'aggregate', 'aggregate', 'aggregate', 'arithmetic', 'arithmetic']