How many large metal balls are left fot the large blue sphere?
return balls ;return #1 that  are large ;return #2 that  are metal ;return sphere ;return #4 that  is  large ;return #5 that  is  blue ;return #3 that  is  left of #6 ;return number of  #7
['select', 'filter', 'filter', 'select', 'filter', 'filter', 'filter', 'aggregate']