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εἰδῶ

Γηράσκω δ᾽ αἰεὶ πολλὰ διδασκόμενος -> I grow old always learning many things
Solon the Athenian

French (Bailly abrégé)

ῇς, ῇ;
sbj. de οἶδα, pf.2 de *εἴδω.

Russian (Dvoretsky)

εἰδῶ: эп. εἰδέω pf. conjct. к *εἴδω.