Umlauts aren't diphtongs; it's the same sound all the way through. GP used two consecutive ones in order to show that the sound is long. (And whaddoino, if the

Umlauts aren't diphtongs; it's the same sound all the way through. GP used two consecutive ones in order to show that the sound is long. (And whaddoino, if the dialect has an official orthography, maybe that's how it's supposed to be spelled.)