How many small items are the same shape as the pair of large items?
return items ;return #1 that are large ;return #1 that are small ;return shape of #2 ;return shapes of #3 ;return #3 where #5 is the  same as #4 ;return number of  #6
['select', 'filter', 'filter', 'project', 'project', 'comparative', 'aggregate']