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the offer, and at the same time to have made a new offer.

529.

A person who advertises that he will give a certain reward to whoever shall do a certain act is bound to give such reward to any person who does the act.

530.

The advertiser may at any time before the specified act has been completed, withdraw his advertisement by the same means which he used for advertising, unless he has declared therein that he would not withdraw it.

If the advertisement cannot be withdrawn by the means aforesaid, withdrawal may be made by other means, but in such case it is valid only as against those persons who know of it.

If the advertiser has fixed a time within which the specified act must be done, he is presumed to have renounced his right of withdrawal.

531.

If several persons do the act specified in the advertisement, only that one who does it first has a right to receive the reward.

If several persons do such act at the same time, each one has a right to receive an equal share of the reward. But if the reward is by its nature unsuited to be divided, or if according to the advertisement only one person can receive it, the person to receive it is determined by lot.

The foregoing provisions do not apply, if in the advertisement a different intention is expressed.