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Those are only the main ones. Even now there are still a few speakers of isolated Greek dialects/languages (e.g. in Italy and along the Black sea) other than the standard modern Greek, and in Ancient times there were more, who used alternate orthographies to accommodate their own pronunciation (e.g. preserving H to indicate |h| instead of |e:| or replacing θ (th) with φ (ph), as θ is a particularly difficult phoneme to learn).