EQUIS O YE PERSON (and no equis) any two persons, whose names are unknown. Academically we talk about FULANO , ZUTANO and, if necessary a third party, MERENGANO . There is an unknown room, PERENGANO/E] or PERENJO . I prefer to use the one that rhymes, if only to show off, since with three subjects the idea is more than clear. Some synonyms, similar words or expressions may be person x or person y , fulano or zutano
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