If exactly one chow dog is standing with all four paws on the ground.
return chow dogs ;return #1 that are standing ;return paws of #2 ;return the  ground ;return #3 that are on #4 ;return number of  #5 for each  #2 ;return #2 where  #6 is equal to  four ;return number of  #7 ;return if  #8 is equal to  one
['select', 'filter', 'project', 'select', 'filter', 'group', 'comparative', 'aggregate', 'boolean']