c. Two contiguous vowels after the accented syllable.
(1) Two contiguous strong vowels after the accented syllable naturally
form a diphthong.
Ex. _Tú, sombra aére^a que, cuantas veces_, p. 170, XV, l. 7.
Diaeresis may be employed to dissolve the diphthong.
(2) If a strong vowel is followed by a weak vowel after the accented
syllable, they form a diphthong, e.g. _hablaba^is, amara^is_.
This diphthong is easily dissolved.
(3) If a weak vowel is followed by a strong vowel after the accented
syllable, they form a diphthong, e.g. _histor^i^a, ans^i^a_.
Ex. _De la brisa nocturna al tenu^e soplo_, p. 192, LXXV, l. 6.
The diphthong may, however, be dissolved, e.g. _estatu|a, tenu|e,
nadi|e_.