What is the indefinite article for toro, toros, gallina, gallinas, vaca, vacas, pajaro, pajaros, perro, perros, gallo, gallos, cerda,…

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What is the indefinite article for toro, toros, gallina, gallinas, vaca, vacas, pajaro, pajaros, perro, perros, gallo, gallos, cerda, cerdas, gata, gatas, cerdo, cerdos, pez, and caballos?