The worker shall be deprived of his end of service gratuity in the following two cases:
a - Should he be dismissed from service for any of the reasons set forth in Article 120 hereof or should he leave his employment in view of avoiding the dismissal there from in accordance with the said Article.
b - Should he leave his employment of his own accord , and without notice in cases other than the ones set forth in Article 121 hereof , and such with regards to contracts with undetermined term , or prior to the completion of five years of continuous service with regards to contracts with determined term.