If only one gerbil per picture.
return gerbils ;return pictures ;return number of  #1 for each  #2 ;return #2 where  #3 is equal to  one ;return number of  #2 ;return number of  #4 ;return if  #5 is equal to  #6
['select', 'select', 'group', 'comparative', 'aggregate', 'aggregate', 'boolean']