If treeless hills are behind a group of llamas, with at least one wearing a pack, in the left image.
return left image ;return llamas in  #1 ;return #2 that are in  a  group ;return hills in  #1 ;return #4 that are treeless ;return #3 that #5 are behind ;return pack in  #1 ;return #6 that is wearing #7 ;return number of  #8 ;return if  #9 is at least one
['select', 'project', 'filter', 'project', 'filter', 'filter', 'project', 'filter', 'aggregate', 'boolean']