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3. The classic:
You come to a magic island where you meet three strange and wise friends.
One of them is always telling the truth, another one is always lying, and the third is deaf, so he answers randomly and cannot lie(!).
You ask the first: "Are you lying?", and he answers: "No".
You ask the second: "Is the first one lying?", and he answers: "No".
You ask the last: "Is the second one lying?", and he answers: "No".
Which one of the three wise will always tell the truth?