You meet two of the inhabitants of this country, Percival and Llewellyn. Percival says, "At least one of us is a liar." Is Percival a liar or a truth teller? What about Llewellyn? Explain your answer.
In Exercises 61-64, you are traveling in a certain country where every inhabitant is either a truthteller who always tells the truth or a liar who always lies.