hubieran conferido
-they/you had conferred
Past perfect subjunctive ellos/ellas/ustedes conjugation of conferir.

conferir

Habidite también presentó argumentos detallados específicos para impugnar que alguno de los dos convenios notificados le hubieran conferido una ventaja.
Habidite also put forward specific detailed arguments to contest that any of the two notified contracts would have conferred on it an advantage.
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leftovers