If in at least one image there is a single purple headed crab crawling in the ground.
return crabs ;return head of #1 ;return #1 where  #2 is purple ;return the  ground ;return #3 crawling in  #4 ;return images of #5 ;return number of  #5 for each  #6 ;return #6 where  #7 is equal to  one ;return number of  #8 ;return if  #9 is at least one
['select', 'project', 'comparative', 'select', 'filter', 'project', 'group', 'comparative', 'aggregate', 'boolean']