The aggregated contribution periods shall not be complementary periods for the entitlement for retirement pension before attaining the age of sixty in the last Scheme. The contributor shall complete the period required by this Scheme, unless the reasons for aggregation are a result of privatization or the service termination is a result of death or disability. In case of aggregation resulting from privatization, the contributor may not combine the retirement pension and salary of employment covered by the Civil or Military Retirement Scheme or Social Insurance Scheme".