Is there a square reflected in a large purple ball? 
return balls ;return #1 that  are purple ;return #1 that  are large ;return #1 in both #2 and #3 ;return squares ;return #5 that  are reflected in any  #4 ;return number of  #6 ;return if  #7 is  at least one
['select', 'filter', 'filter', 'intersection', 'select', 'filter', 'aggregate', 'boolean']