hubieran desechado
Past perfect subjunctive ellos/ellas/ustedes conjugation of desechar.

desechar

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Por último,la recuperaciónde energía que permite que unos materiales (objetos,embalajes, etc.) que se hubieran desechado, se utilicenpara producir energía.
Finally, energy recovery is a process that takes materials (objects, packaging, etc.) that would have otherwise been dumped in a landfill, and uses them to produce energy.
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