Some people in the company suggested that as long as the employees signed the commitment letter and promised not to be late. The company canceled the punch-in and check-out system. If someone was late, the monthly bonus for all employees would be deducted. The company adopted the recommendation and as a result some employees were late, but, Employee Xiao Liu still got the bonus for the month. It can be inferred from this text:. ['Xiao Liu has never been late.', 'Other employees did not receive bonuses.', 'Someone from the company did not sign the letter of commitment.', 'People who are late are not regular employees of the company.']