How many more camels were there compared to members of the Egyptian coastguard at Senussi?
return camels ;return #1 at Senussi ;return the  Egyptian coastguard ;return members of #3 ;return #4 at Senussi ;return number of  #2 ;return number of  #5 ;return the  difference of #6 and  #7
['select', 'filter', 'select', 'project', 'filter', 'aggregate', 'aggregate', 'arithmetic']