Contract: An agreement between the parties to establish, change, or terminate a civil relationship. A lawfully established contract is protected by law. The establishment of a contract must follow two principles: ① the principle of law; ② equality and mutual benefit, consensus, and the principle of equal pay. Based on the above definitions, which of the following is not part of the contract? ['The school needs to acquire land for the expansion of the campus. After negotiation, it will sign a contract with the real estate owners around the school, purchase it at 2,500 yuan per square meter, pay first and then demolish it. If the contract is not fulfilled within one month, the contract will be delivered to the default party gold.', 'A company has entered into a one-year cooperative relationship contract with its raw material supplier. The company provides the raw material factory with a one-time fund of 100,000 yuan for its turnover. The raw material factory guarantees to provide the company with a certain amount of raw materials each month.', 'Two thieves enter into a life-and-death agreement before committing the crime, and once one of the two is caught, the second person must never be offered.', 'A publisher signs a cooperation agreement with a writer. The writer writes a 150,000-word documentary novel. The publisher pays him 10,000 yuan as a reward after the book is completed.']