have been sifting
-he estado tamizando
Present perfect progressive conjugation of sift. There are other translations for this conjugation.

sift

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Since that day, we have been sifting through the material and putting it in order (see publication criteria below.)
Desde ese día hemos estado cribando y ordenando el material [ver criterio de publicación] para preparar su publicación de la forma más directa posible.
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