How many more tanks than aircraft were sold to Bahrain after the Gulf War?
return tanks ;return aircraft ;return #1 that were sold to Bahrain ;return #2 that were sold to Bahrain ;return #3 after the  Gulf War ;return #4 after the  Gulf War ;return number of  #5 ;return number of  #6 ;return difference of #7 and  #8
['select', 'select', 'filter', 'filter', 'filter', 'filter', 'aggregate', 'aggregate', 'arithmetic']