If exactly one of the binders has two diagonal lines across its front.
return binders ;return front of #1 ;return lines ;return #3 that are diagonal ;return the  number of  #4 for each  #2 ;return #2 where  #5 is equal to  two ;return the  number of  #6 ;return if  #7 is equal to  one
['select', 'project', 'select', 'filter', 'group', 'comparative', 'aggregate', 'boolean']