Four liquids are poured into a separatory funnel in the following order: 40 mL hexane (density 0.66 g mL⁻¹), 40 mL carbon tetrachloride (density 1.59 g mL⁻¹), 40 mL ethanol (density 0.79 g mL⁻¹), and 40 mL water (density 1.00 g mL⁻¹). After vigorous mixing and allowing the system to reach equilibrium, list the layers from top to bottom and identify the liquid or mixture of liquids present in each layer.