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Amy says Brad is lying. Brad says Chris is lying. Chris says Amy and Brad are lying. Who is lying?
The right answer is: Amy and Chris
If Chris is telling the truth, Amy is lying. But this would mean Brad is telling the truth (this contradicts Chris’s statement). Chris must be lying. If Chris is lying, Brad must be telling the truth. If Brad is telling the truth, Amy must be lying. So Amy and Chris are lying.
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