80. The Next Trial

- As it is now, I remember another most curious trial, - said the White Knight. There were three defendants. Each of them accused one of the other two. The first defendant was the only one who told the truth. If each of the defendants had accused not the one they did, but the other, then the second defendant would have been the only one who told the truth.

Who among the three defendants is guilty?
80. The next court case. This is a very simple task. Since $A$ told the truth and accused one of the other two defendants, either $B$ or $C$ must be guilty. Therefore, $A$ is innocent. If each defendant had accused the other person instead of the one they actually accused, then $B$ would have told the truth. Since we know that $A$ is innocent, $B$ accused $C$ at the trial. Therefore, $C$ is guilty.