there is a large purple cube, large blue cube, what shape is in front of the blue cube, but behind the purple cube?
return cubes ;return #1 that  are large ;return #2 that  is  blue  ;return #2 that  is  purple ;return objects ;return #5 that  is  in  front of #3 ;return #6 that  is  behind #4 ;return shape of #7
['select', 'filter', 'filter', 'filter', 'select', 'filter', 'filter', 'project']