4.The employees and persons to whom this plan applies are, for the purposes of this plan, considered to be employees unless they are pensioners under this plan, the Government and Public Employees Retirement Plan, the Pension Plan of Peace Officers in Correctional Services, the Teachers Pension Plan, the Civil Service Superannuation Plan, the Pension Plan of Certain Teachers or the pension plans established pursuant to sections 9, 10 and 10.0.1 of the Act respecting the Government and Public Employees Retirement Plan (chapter R-10).