How many of the officers killed at at Ashitla were not found mutilated the next day?
return officers ;return #1 that were killed at Ashitla ;return #2 that were found mutilated the  next day ;return number of  #2 ;return number of  #3 ;return the  difference of #4 and  #5
['select', 'filter', 'filter', 'aggregate', 'aggregate', 'arithmetic']