(2) DIERESIS
By poetic license vowels that normally form one syllable may often be dissolved into separate syllables (this is called "dieresis") at the will of the poet: glo|rio|so or glo|rï|o|so, rui|do or rü|i|do, etc.[17] See also (1), d, above.
Footnote 17:[ (return) ] Note that the dieresis mark is generally used in dieresis of two weak vowels, or of strong and weak vowels where the strong vowel is stressed.
But dieresis is impossible if the diphthong is ie or ue from Latin [e] and [o] respectively, as in bien, siente, huevo, puedo.
(3) SYNALEPHA
The final vowel or diphthong of one word and the initial vowel or diphthong of an immediately following word in the same line usually combine to form one syllable (this is called "synalepha")[18] as in:
Cuan|do | re|cuer|do | la | pie|dad | sin|ce|ra
Con | que en | mi e|dad | pri|me|ra
En|tra|ba en | nues|tras | vie|jas | ca|te|dra|les.