hayamos concentrado
Present perfect subjunctive nosotros conjugation of concentrar.

concentrar

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Tal vez nos hayamos concentrado demasiado en los Balcanes.
Maybe we have focused our attention too much on the Balkans.
En efecto, no es cierto que nos hayamos concentrado solamente en la técnica o en la infraestructura.
For it is not true that we have concentrated only on technology or on infrastructure.
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