Three lightness: speaking lightly, walking lightly and operating lightly
Four diligence: eye diligence, mouth diligence, hand diligence and leg diligence
Five tones: 1 There is a "welcome sound" when the customer enters the store
2 There is a "response sound" when the customer asks
3 There is a "thank you sound" when the customer helps
4 There is an "apology sound" when the customer leaves.