orange [thickened upgrade]] blue [thickened upgrade]] green [thickened upgrade]]

10 layers [more layers, more space-saving]] 9 layers [more layers, more space-saving]] 8 layers [more layers, more space-saving]] 7 layers [more layers, more space-saving]] 6 layers [more layers, more space-saving]] 5 layers [more layers, more space-saving]] 4 layers [more layers, more space-saving]] 3 layers [more layers, more space-saving]] 2 layers [more layers, more space-saving]] 1 layer [more layers, more space-saving]]