Jewelry was stolen from a jewelry store, and the criminal has been identified as Qiansun Zhaoli. One of them has four confessions: Zhao said I didn't steal the money, Li said Li was a criminal and Sun said money was a crime. Money is a criminal, money tells lies and the other three tell the truth. The contradiction between Qian's saying that Li is a criminal and Li's saying that I didn't steal it is that one person must tell the truth and the other person must tell a lie, and then assume that Qian's telling the truth does not meet the conditions of three truths and one falsehood, while Li's telling the truth meets the preconditions of three truths and one falsehood.