A scheme is properly arranged的用法和样例：
- See that everything is properly arranged beforehand.
- The mastermind behind the scheme is executed after a brief trial.
- The eavesdropping analysis shows explicitly that the scheme is secure. It is proper to generalize the triple-party QSS protocol to the multiparty situation.
- It is proper that such a bad man be punished severely.
- The scheme is still on the anvil.