in a non muggle land, there are three types of people death eaters: that only lie, wizards: that only tell the truth, and dementors: that can tell both. You meet three people. The one on the left says"The person next to me is a death eater."The one in the middle says both people next to me are lying."The one on the right says "all of us are wizards." which one of them is the wizard(telling the truth)
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The one on the left does not have a sufficient reason for what he says because if you try to prove that the one on the left is telling the truth you get a contradiction in the problem so he is lying, the one on the right is declaring that everyone tells the truth that this is impossible because it is someone who is lying and the one in the middle tells the truth since if it is between two liars.