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Mortgages by will of parties, arising from contracts may be proved by public deed or public proceeding, or if, the amount secured by mortgage does not exceed 1,000$ (escudos), by private document, written and signed by the person who is creating mortgage, or if he does not know or is unable to write, by another, at his request, with signature of two witnesses, who write their names, and, in any event, the signatures are authenticated by the notary.