How many items are behind the large shape behind the green ball.
return shapes ;return #1 that  are large ;return balls ;return #3 that  are green ;return items ;return #2 that  is  behind the  #4 ;return #5 that  are behind #6 ;return number of  #7
['select', 'filter', 'select', 'filter', 'select', 'filter', 'filter', 'aggregate']