comiesen
Imperfect subjunctive ellos/ellas/ustedes conjugation of comer.

comer

Las piñas eran recogidas antes de que se abriesen o cayesen al suelo para evitar que los roedores o los pájaros se comiesen las semillas.
Pine cones were collected before they a opened or before they falled to the ground to prevent rodents or birds to eat the seeds.
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to stay up late