hubieren declarado
-they/you will have stated
Future perfect subjunctiveellos/ellas/ustedesconjugation ofdeclarar.

declarar

La adhesión solo surtirá efecto en las relaciones entre el Estado adherente y los Estados contratantes que hubieren declarado aceptar dicha adhesión.
The accession will have effect only as regards the relations between the acceding State and such Contracting States as will have declared their acceptance of the accession.
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celery