If a single instrument lies alone in each of the images.
return images ;return instruments in  #1 ;return #2 that lie alone ;return number of  #3 for each  #1 ;return #1 where  #4 is equal to  one ;return number of  #5 ;return number of  #1 ;return if  #6 is equal to  #7
['select', 'project', 'filter', 'group', 'comparative', 'aggregate', 'aggregate', 'boolean']