Work centers W$,$ X$,$ Y$,$ and Z are available for $40$ hours per week and have no setup time when switching between products. Market demand for each product is $80$ units per week. In the questions that follow, the traditional method refers to maximizing the contribution margin per unit for each product, and the bottleneck method refers to maximizing the contribution margin per minute at the bottleneck for each product.

Use the information in Table $5\mathrm{.}1.$ Using the traditional method, in what sequence should products be scheduled for production?