Exercise: Establishing something and Maintaining it

Is there a difference between these things, if so, what is the difference?

• Setting up (establishing) a rule that says “do not enter the room without knocking”
• Maintaining the rule the says “do not enter the room without knocking”

• Forming (Establishing) a friendship
• Maintaining that person as a friend

• Forming (Establishing) a reputation for fairness
• Maintaining a reputation for fairness