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Unless otherwise decided by the Contracting Party concerned, a refugee seaman will cease to be regarded as lawfully staying in the territory of a Contracting Party when he, after the date upon which he, in accordance with Article 2 or 3 of this Agreement, last became entitled to be so regarded
a) has established his residence in the territory of another State, or
b) within any period of six years following that date, has been serving a total of 1350 days on ships flying the flag of one other State, or
c) within any period of three years following that date, neither has served at least a total of 30 days as a seafarer on ships flying the flag of that Contracting Party and calling at least twice a year at ports in its territory nor has stayed for at least a total of 10 days in the territory of that Party.