If someone leaves two messages, then that means that five people leave messages. So F, P, T, H and L are in. P has to be before T, and H has to be before L.
A is CORRECT. This could be the order:
B is wrong. If H is first, P must be last (rule 3).
C is wrong. If L leaves the first message, then L is not before H. That can’t happen when P is in (which is always).
D is wrong because if P leaves the last message, then they therefore leave a message after T. That can’t happen when F is in (rule 5).
E is wrong because T leaves a message before P, if T leaves the first message.
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