Working with porcelain: Refers to the use of loopholes in the management of an enterprise by individual workers to cause illegal behavior in the enterprise, and then to demand economic benefits such as double wages or economic compensation. Which of the following belongs to labor? ['After Lin applied for a company, he did not sign a labor contract with the company under various excuses. Three months later, Lin filed an application to the labor arbitration department on the grounds that the company refused to enter into a labor contract with him, asking the company to compensate for the unsigned contract. Double pay during the period.', 'After working for one year, Ms. Ding found that the company did not pay her endowment insurance for her, and after many negotiations, she did not get a satisfactory result, she applied to the labor arbitration department and asked the company to pay her endowment insurance for her.', 'er Ms. Hong gave birth to her second child, the factory deducted half of her salary during pregnancy and persuaded her to resign. Ms. Hong finally decided to sue to the court, asking the factory to make up her salary bonus and give compensation.', 'More than 10 workers recruited by a company did not sign a written labor contract. They were dismissed collectively because of continuous demands for increased wages. After a few days, they refused to sign a labor contract on the basis of the company. continue working.']