Joke Collection Website - Bulletin headlines - What is the specific difference between the words "no admittance, no admittance, no disturbance, no admittance unless necessary"? Don't you always keep people away from one place?

What is the specific difference between the words "no admittance, no admittance, no disturbance, no admittance unless necessary"? Don't you always keep people away from one place?

No entry for idle people: idle people refer to irrelevant people.

No entry: No entry except for management personnel. This is a serious regulation, and violators will be held accountable.

Do not disturb: refuse visitors, including shouting and knocking at the door.

Please don't enter unless invited.