The merger of the service periods referred to in the preceding Article shall require the following:

1 - The insured must express his desire in writing to include such periods prior to the termination of the service thereof, provided that he encloses with his request the necessary certificates and documents.

2 - The previous service durations required to be included must not have ended due to reasons of total deprivation of the pension or the allocation.

3 - The periods required to be included must not be temporary, daily or one of the probation periods that precede the appointment.

4 - The insured shall pay his share as well as the share of the employer for the period required to be included in the calculation of the salary of subscription calculation all at once at the date of the request of inclusion. The sums may be paid in monthly installments amounting to one quarter of the salary at least. The duration of the installments shall not exceed the age of sixty of the insured. In all cases, the entire expenses of inclusion shall be paid prior to the termination of the service. The obligation of payment of installments shall abate should the service of the insured end in death and the value of the paid installment reach 50 % of the total sum due thereby. Should the value of the sums paid thereby be less than 50 %, the remainder shall be deducted from the pensions of the beneficiaries thereof.