hubieren preparado
-they/you will have prepared
Future perfect subjunctiveellos/ellas/ustedesconjugation ofpreparar.

preparar

El Comité Internacional de la Cruz Roja tendrá a disposición de las Altas Partes contratantes las listas de las personas así formadas que las Altas Partes contratantes hubieren preparado y le hubieren comunicado al efecto.
The International Committee of the Red Cross shall hold at the disposal of the High Contracting Parties the lists of persons so trained which the High Contracting Parties may have established and may have transmitted to it for that purpose.
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celery