hubieron cooperado
-they/you had cooperated
Preterite perfect ellos/ellas/ustedes conjugation of cooperar.

cooperar

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También he recibido cartas, de una buena cantidad de humanos buenos, quienes sostienen que los Zetas vienen con gran honestidad, que hubieron cooperado con ellos en una buena forma.
I have also received letters, from quite good earth humans, who had the Zetas come in greater honesty, would have cooperated with them in a good way.
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