If there are two chihuahuas with their heads to the right and tails up to the left.
return chihuahuas ;return heads of #1 ;return tails of #1 ;return #1 where  #2 are to  the  right ;return #1 where  #3 are up to  the  left ;return #1 in  both  #4 and #5 ;return number of  #6 ;return if  #7 is equal to  two
['select', 'project', 'project', 'comparative', 'comparative', 'intersection', 'aggregate', 'boolean']