If one dog is wearing a collar with a round tag clearly visible.
return dog ;return collar of #1 ;return tag of #2 ;return #2 where  #3 is round ;return #2 where  #3 is clearly visible ;return #1 that is wearing #5 ;return number of  #6 ;return if  #7 is equal to  one
['select', 'project', 'project', 'comparative', 'comparative', 'filter', 'aggregate', 'boolean']