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Those obliged to deliver or to do something incur in delay from the time the obligee judicially or extrajudicially demands from them the fulfillment of their obligation. However, the demand by the creditor shall not be necessary in order that delay may exists: • When the law or obligation so expressly declares; • When from the nature of the contract, time us the essence and motivating factor for its establishment; • When demand would be useless (prestation is impossible); • In reciprocal obligations, from the moment one of the parties fulfills his obligation; • When the debtor admits he is in default

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