If two dogs have their mouths open and tongues sticking out.
return dogs ;return mouth of #1 ;return #1 where  #2 are open ;return tongues of #3 ;return #3 where  #4 are sticking out ;return number of  #5 ;return if  #6 is equal to  two
['select', 'project', 'comparative', 'project', 'comparative', 'aggregate', 'boolean']