were sealing
Past progressiveconjugation ofseal.There are other translations for this conjugation.

seal

The PSOL and the PSTU joined together, seeking to reposition themselves, while they were sealing an agreement to put an end to the occupation.
El PSOL y el PSTU se incorporaron buscando reubicarse, mientras cerraban un acuerdo para terminar con la ocupación.
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