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