I was once kindly allowed to use the staff's bathroom in a furniture store (as the costumer toilet wasn't working) and found a similar sign just opposite the toilet. "Customer wants to buy a sofa - ask A, B, C, D. Customer wants to buy a bed - ask E, F, G, H." And so on. In the questionnaire, you had to mark if exactly these questions were asked - did the salesperson ask A? B? C? D?