If there are two dogs with black fur and floppy ears.
return dogs ;return fur of #1 ;return #1 where  #2 is black ;return ears of #1 ;return #3 where  #4 are floppy ;return the  number of  #5 ;return if  #6 is equal to  two
['select', 'project', 'comparative', 'project', 'comparative', 'aggregate', 'boolean']