The crime of contract fraud refers to the act of illegal possession for the purpose of defrauding the other party's property in a large amount during the process of signing and performing the contract, using fictitious facts or concealing true and equivalent deception. According to the above definitions, Which of the following are not crimes of contract fraud:. ['A person signs a cooperative school running contract with the outside world in the name of the college without the consent of the college.', 'A person forged a contract with a customer and forged a certificate of fixed assets as a guarantee.', "A borrowed the seal and contract text of his uncle's company to sign a contract with company K.", "After signing the contract, Ding absconded with the other party's prepayment of 200,000."]