Ask at the forum if you have an Ancient or Modern Greek query!

δυοῖν

Μὴ φῦναι τὸν ἅπαντα νικᾷ λόγον -> Not to be born is, past all prizing, best.
Sophocles, Oedipus Coloneus l. 1225

Russian (Dvoretsky)

δυοῖν: gen. и dat. к δύο.