What is the shape of the item behind the yellow cylinder, but in front of the green cylinder?
return the   yellow cylinder ;return the   green cylinder ;return items ;return #3 that  are behind #1 ;return #3 that  are in front of #2 ;return #3 in both #4 and #5 ;return the   shape of #6
['select', 'select', 'select', 'filter', 'filter', 'intersection', 'project']