Esas vs. ésas
Note: the usage of "ésas" is now considered obsolete and "esas" is used instead.
Esas
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those (feminine)
¿De quién son esas cosas? (Whose things are those?)Esas flores silvestres desprenden un aroma agradable. (These wild flowers give off a nice smell.)
Ésas
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those ones (feminine)
Ésas son personas muy famosas. (Those are very famous people.)Ésas no son tus sillas. (Those are not your chairs.)