(Calderón, No hay burlas con el amor, III)
Cf. also rendíos, etc., where the o of os combines with the í by synalepha.
(b) uá, uó, are usually disyllabic, except after c, g, and j: a|dü|a|na, sü|a|ve; but cua|tro, san|ti|guó, Juan, etc. Syneresis may occur: sua|ve.
(c) úi is usually disyllabic, except in muy: flú|i|do.
(d) Two unstressed strong vowels, if they follow the stress, regularly form a diphthong; but if they precede they may form a diphthong or they may be dissyllabic, usually at the option of the poet.
Que | del | em|pí|reo en | el | ce|nit | fi|na|ba.[15]
Las | mar|mó|reas|, y aus|te|ras | es|cul|tu|ras.
La | ne|gra ad|ver|si|dad|, con | fé|rrea | ma|no.