estaban fermentando
-they/you were fermenting
Imperfect progressive ellos/ellas/ustedes conjugation of fermentar.

fermentar

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Kibitoshin dio un montón de ideas, con muchos detalles, divertido ante la idea del plan que estaban fermentando.
Kibito Kai gave him many ideas, with several details. He was amused at the thought of the plan they were plotting.
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