Art 64 (2) In cases where the buyer has paid the price, the seller loses the right to avoid the contract unless he does so: (a) in respect of late performance by buyer, before the seller has become aware that performance has been rendered; or (b) in respect of any breach other than late performance by the buyer, within a reasonable time: (i) after the seller knew or ought to have known of the breach; or (ii) after the expiration of any additional period fixed under art 63, or after the buyer has declared he will not perform within such additional period.
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