is the largest item the only one of its shape?
return items ;return #1 that  are the  largest ;return the  shape of #2 ;return #1 besides #2 ;return the  shapes of #4 ;return #4 where #5 is  the  same as #3 ;return the  number of  #6 ;return if  #7 is  zero
['select', 'filter', 'project', 'discard', 'project', 'comparative', 'aggregate', 'boolean']