hubieren nacido
Future perfect subjunctive ellos/ellas/ustedes conjugation of nacer.

nacer

El acto administrativo regular, del que hubieren nacido derechos subjetivos a favor de los administrados, no puede ser revocado, modificado o sustituido en sede administrativa una vez notificado.
A regular administrative act which has given rise to civil rights may not be revoked, amended or substituted at administrative level once it has been notified.
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to heat