If two large dogs have black faces and their mouths open.
return dogs ;return #1 that are large ;return faces of #1 ;return mouths of #1 ;return #2 where  #3 is black ;return #5 where  #4 is open ;return the  number of  #6 ;return if  #7 is equal to  two
['select', 'filter', 'project', 'project', 'comparative', 'comparative', 'aggregate', 'boolean']