## 102.

This riddle is a bit more challenging. Suppose the criminal is not a normal person, but either a knight or a liar. You are not guilty. What statement, which could come from a knight, a liar, or a normal person, would you make in court to convince the jury of your innocence?
102. One solution is for you to state in court: "Either I am a knight and not guilty, or I am a liar and guilty." Let's rephrase your statement more simply: "I am either an innocent knight or a guilty liar." Upon hearing such a statement, the jurors would reason as follows.

First step. Suppose he is a knight. Then his statement is true. Therefore, he is either an innocent knight or a guilty liar. He cannot be a guilty knight because he is not a liar. Therefore, he is an innocent knight. Consequently, he is not guilty.

Second step. Suppose he is a liar. Then his statement is false. Therefore, he is neither an innocent knight nor a guilty liar. In particular, he cannot be a guilty liar. But he is a liar. Therefore, he is an innocent liar and, thus, not guilty.

Third step. If he is a normal person, then he is certainly not guilty, as a criminal is not a normal person.