End in "oy" in the yo, estar, dar, ir, change to -ZCO/-ZO in the yo, conducir, conocer, ofrecer, parecer, producir, convencer, change to "J" in the yo (sound change), corregir (e:i), dirigir, elegir (e:i), fingir, proteger, drop the "u" and end in "go" in the yo (sound change), conseguir (e:i), distinguir, extinguir, seguir (e:i), end in "-go" in the yo, hacer, decir, poner, salir, venir (e:i), end in "-aigo" in the yo, caer, traer, add a "y" in the boot, concluir, construir, contribuir, destruir, incluir, No Pattern, ver, ser, saber, oír

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