What shape is the large object with two metallic spheres behind it?
return objects ;return #1 that are large ;return spheres ;return #3 that are metallic ;return #4 that are behind of #2 ;return number of  #5 for each  #2 ;return #2 where #6 is  equal to  two ;return shape of #7
['select', 'filter', 'select', 'filter', 'filter', 'group', 'comparative', 'project']