Robuta

https://tug.org/pipermail/xetex/2013-September/024705.html

[XeTeX] [tex-hyphen] Hyphenation of polytonic Greek (expressed in Unicode)

polytonic greek xetex hyphen expressed unicode

https://tug.org/pipermail/xetex/2006-July/004461.html

[XeTeX] Can't activate hyphenation for Unicode polytonic Greek

can t polytonic greek xetex activate hyphenation