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 if the testator did not write the whole will himself, he must also notify them of the name and domicile of the writer;

when the district commissioner has noted the statement of the testator and the day, month, and year of the presentation of the will down on the envelope and affixed the seal of his office thereto, the district commissioner, the testator, and the witnesses shall sign on the envelope.

Erasure, addition, or other alteration made to the will is invalid, save where it is accompanied by the signature of the testator.

If a person who is both mute and deaf or a person who cannot speak wishes to make a will in the form of a secret document, such person shall write by himself on the envelope of the will in the presence of a district commissioner and witnesses a statement that the sealed will belongs to him, instead of giving a statement in accordance with section 1660(3), and the name and domicile of the writer of the will, if any, shall also be written.