" If you get 'no', it's the civilization path; otherwise, it's the death path. You never get a true reply because one of them is always lying and distorting the truth, either directly or indirectly. If both of them were telling the truth or lying, then you would get a true answer.
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You go to one of the paths and ask the guy, "If I go to the other guy and ask if this path goes to civilization or not, what will he say?"
If you get 'no', it's the civilization path; otherwise, it's the death path. You never get a true reply because one of them is always lying and distorting the truth, either directly or indirectly.
If both of them were telling the truth or lying,