Group 1 - The article emphasizes that a written labor contract must be established between the employer and the employee from the start of the employment relationship [3][4] - It is stated that the employer is required to provide a written labor contract upon renewal, and failing to do so is deemed unreasonable [4][10] - The essential clauses that must be included in a labor contract are outlined, including the employer's name, employee's details, contract duration, job responsibilities, working hours, remuneration, social insurance, and other legal requirements [8][11] Group 2 - The article clarifies that a probation period can only be agreed upon once for the same employee in the same company, even if the employee returns to a different position [9] - If an employer fails to sign a written labor contract within one month of employment, they are obligated to pay the employee double wages for each month until a contract is signed, as stipulated by the Labor Contract Law [10][11]