IL-GILLIS 2018 Problem 1
people sit in a circle. Each of them is either a liar (always lies) or a truthteller (always tells the truth). Every person knows exactly who speaks the truth and who lies. In their turn, each person says 'the person two seats to my left is a truthteller'. It is known that there's at least one liar and at least one truthteller in the circle.
[list=a] [] Is it possible that [] Is it possible that [/list]
Dataset text AI-MO AoPS. Quoted with source.
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