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 for the life of the beneficiary, but if the beneficiary is a juristic person, it shall merely endure for thirty years.

If a time limit has been designated for the inalienability provision, such limit cannot exceed thirty years. If it has been designated to last longer than that, it shall be decreased to thirty years.

An inalienability provision concerning an item of movable property the ownership over which cannot be registered shall be deemed to never exist at all.

An inalienability provision concerning an item of immovable property or real right relating thereto shall be imperfect, save where it is made in writing and registered with a competent authority.

The provisions of the previous paragraph shall also apply to seagoing vessels or vessels with capacity of six tons or more, steam-powered vessels or motor vessels with capacity of six tons or more, floating houses, and beasts of burden.

A will made by a person who has not yet attained full fifteen years of age is void.