[gacgacgac]

I was gearing up to suggest that diaeresis very absolute valid English, but dug in a bit. It's not just a u with a diacritic. Ü is a separate letter in Turkish, with a more "ooh" or "ouh" like sound. TIL.

[1] https://en.wikipedia.org/wiki/Diaeresis_(diacritic)