hubieran propagado
-they/you had spread
Past perfect subjunctive ellos/ellas/ustedes conjugation of propagar.

propagar

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En cambio, ellas se hubieran propagado entre grupos pequeños de más o menos 15 a 30, lo que los debilitó e hizo que fuera casi imposible sobrevivir.
Instead, they would have spread between small groups of about 15 to 30, weakening them and making it nearly impossible to survive.
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