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Six presentations A, B, C, D, E and F occur once each. B is immediately after A, C is before A, D is after B, E is before D, and F is not first. Which pair contains the only presentations that could be last?
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Six presentations A, B, C, D, E and F occur once each. B is immediately after A, C is before A, D is after B, E is before D, and F is not first. Which pair contains the only presentations that could be last?