$1.$ Indicate the changes $($using the shorthand representation$)$ that you would need to make to the original Tal database design $($see Figure $2-1)$ to support the following requirements. A customer is not necessarily represented by a single sales rep, but can be represented by several sales reps. When a customer places an order, the sales rep who gets the commission on the invoice must be in the collection of sales reps who represent the customer.