castilian: irregular conjugations on only some forms

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¿does anyone know how to modify the {{es-verb}} and {{es-conj}} templates for only some irregular conjugations? the source says:

Tiene la anomalía de mudar la 'on' en 'ue' en algunos tiempos y personas: como Yo demuestro, demuestra tu, demuestre aquel, &c. Brawlio (talk) 17:48, 26 November 2024 (UTC)Reply

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