Camp Halcyon and Camp Placid are two summer camps with the following daily policies on pool use and clean-up duties.

Camp Halcyon's Policy: If you used the pool in the afternoon and you didn™'t clean up after lunch, then you must clean up after dinner.

Camp Placid's Policy: You must do at least one of the following: (a) Stay out of the pool in the afternoon, (b) Clean up after lunch, (c) Clean up after dinner.

How do these policies differ? Explain your reasoning.