Summary in spanish:
En suletino el cambio de la "u" no está solamente ocasionado por la "s" y la "r" suave, sino que también por el grupo "nk". Se dan ejemplos
Summary in english:
In Basque from Soule the change of the "u" is not only caused by the "s" and the soft "r", but also by the group "nk". Some examples are provided