15. The period of 24 consecutive months referred to in section 10 of this Act comprises the period during which the employee referred to in section 1 or the person referred to in section 2 was, before 1 January 2001, governed by the special provisions enacted under Title IV.0.1 of the Act respecting the Government and Public Employees Retirement Plan (chapter R-10) as it read on that date, if the employee had not, at that time, completed the 24-month period and if the employee had not lost the right to be so governed on 31 December 2000.