United Express Service (UES) uses large quantities of packaging materials at its four distribution hubs. After screening potential suppliers, UES identified six vendors that can provide packaging materials that will satisfy its quality standards. UES asked each of the six vendors to submit bids to satisfy annual demand at each of its four distribution hubs over the next year. The following table lists the bids received (in thousands of dollars). UES wants to ensure that each of the distribution hubs is serviced by a different vendor. Which bids should UES accept, and which vendors should UES select to supply each distribution hub?

Distribution HubBidder1234Martin Products 180 180 110 240 Schmidt Materials 140 235 145 215 Miller Containers205 215 130 280 D&J Burns 165 185 175 270 Larbes Furnishings 200 190 140 235 Lawler Depot 260 205 140 250