In addition to the basic salary, a large part of the income of employees in a unit comes from performance salary. In April this year, the performance salary of all employees in the first project group of the unit was higher than the maximum performance salary of employees in the second group, but the employee with the highest performance salary of the unit this month was not in the first project group
it follows that:
Some employees of the company do not belong to the first project group or the second project group