Aquellos vs. aquéllos
Aquellos
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those (masculine; far from speaker and listener)
En aquellos tiempos teníamos problemas de dinero. (In those days we had money problems.)Recuerdo aquellos tiempos. (I remember those times.)
Aquéllos
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those ones (masculine; far from speaker and listener)
Aquéllos son mis libros. (Those are my books.)Casi compré uno de aquéllos. (I almost bought one of those.)